Also, may be slightly low on R134. what causes high pressure on the suction line on Rheem R410a ? Evacuate and check for blockage. If the cabin filter is dirty, the result will be low airflow. If the problem exists, it needs engine replacement. If the engine is running and your gauges are showing low side pressure too low and warm air Either way, if you are low on refrigerant then you have a leak that needs to be repaired. Oil pressure drops to zero when engine starts then goes to 60,while driving after warm,pressure drops down 4.3 V6 vortec engine The 4.3 engine should have 20 to 30 psi at idle cold and around 50 to 60 psi running down the road. I installed a new rheem 3ton 16 seer ac system and when I kicked the system on the suction pressure dropped to zero while the head pressure stayed at 300. A temperature-pressure chart can be used to compare the pressure of the refrigerant at a given temperature. With the system running, place a fender cover in front of the condenser and observe the pressure. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. Is voltage being applied to the clutch coil? Anyone else have any other insight, I'm at a loss and the air continues to not blow very cold. cool at best. A low pressure cut-off will prevent the Both of the schrader valves are leaking. I am sure it will cycle if all that is wrong is low freon. This filter is often overlooked until it is entirely plugged up and allows very little airflow into the cab. High side reading is normal but low side immediately pegged the gauge and didnt move. Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. Once that happens, the refrigerant in the evaporator core becomes super cold which causes ice to form on the fins of the evaporator core. The effects of poor oil return to the compressor include first reduced cooling capacity and later damage to the compressor motor. Fix: None needed. Ambient Temperature in F Low side Pressure Gauge reading and High side Pressure Gauge reading 65F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi 70F Ambient temperature: Low side pressure 35-40 psi High side pressure 145-160 psi 75F Ambient temperature: Low side pressure 35-45 psi High side pressure 150-170 psi 80F Ambient temperature: Low side pressure 40-50 psi High side pressure 175-210 psi 85F Ambient temperature: Low side pressure 45-55 psi High side pressure 225-250 psi 90F Ambient temperature: Low side pressure 45-55 psi High side pressure 250-270 psi 95F Ambient temperature: Low side pressure 50.55 psi High side pressure 275.300 psi 100F Low side pressure 50-55 psi High side pressure 315-325 psi 105F Ambient temperature: Low side pressure 50-55 psi High side pressure 330-335 psi 110F Ambient temperature: Low side pressure 50.55 psi High side pressure 340.345 psi. The high side reads 65 psi. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If you missed part I, start here. One typical issue is the unit not blowing cold air, which could be punishing in hot weather. Should be a tag on the radiator support. "Natural refrigerants for refrigeration and air-conditioning systems." Sequence: 1. But if you see the AC low side high, high side low , such as the low side is 100 and the high side is 150, there might be problems with any of the inner components. Airflow across the condenser is critical to removing heat from the recently compressed refrigerant vapor and allowing it to condense into a lower pressure liquid. Not-so-cool air is being blown out. Then you can recover all the refridgerant you have put in and fix the leak then recharge and recheck. Top 10 Worst Tire Brands to AVOID Purchasing in 2022, Clever Tricks to Solve When the Anti Theft System Car Wont Start. Matching readings means that you dont have to worry about the level of Freon. If LOW side drops, like 0, it turns off If the system is properly charged it seems the compressor is not working up to par. The AC system in your car could go through all sorts of problems. WebThe low side pressure drops and fluctuates consistently between 20 and 40 psi during compressor cycling. In this article series we explain how overcharging or undercharging of refrigerant in an air conditioner or heat pump is detected and we list the effects of overcharged or undercharged refrigerant. The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. Evac/pulled vacuum. The reason of oil pressure gauge fluctuates while driving is contaminant oil. If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. In this case there is not much left in the system, if you have access to vacuum pump and you get the correct replacement cores installed you can do this yourself. After the system runs for a while, raise the RPMs up to about 1,500. I flushed the lines with nitrogen and vaccumed the lines before. ", The Fora platform includes forum software by XenForo, Amazon.com: Mastercool (81490) R134A Valve Core Remover Installer: Automotive, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada, driveaccord.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. Double-check to see if the compressor clutch is engaged. Pressure that is too much lower or higher shows there is a problem. Pressure Low: 0. Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. Charged up to correct refrigerant specs of 575g. I evacuated the system to get ready to add 134a. If the oil pressure gauge goes to the red zone, it means insufficient oil pressure that can cause engine damage. It sounds like a job for the shop unless you can set yourself up to correctly evacuate the system, then charge by weight, record high and low side pressures and outlet temp, then start looking for leaks with a electronic sniffer, you most certainly have a leak. Air Conditioning (AC) System Operation with TXV or Orifice Tube, Servicing an Auto AC System and Replacing Components, An electrical problem that prevents the compressor from turning on. - vibration The filter looks like a small air filter from a car. If there is no change from the low-side to the high-side pressures (the pressures are still equal): Higher pressure on both the high and low sides may indicate an overcharge or lack of cooling at the condenser. A generic approach to identifying faults in HVAC plants. Oil pressure drops to zero is not a good sign. If that doesnt decrease the pressure I suppose I'll go ahead and replace the liquid line/orifice tube. I'm thinking a bad compressor could this be right or something else? Question: How do you tell if the condenser is restricted ? Update, tried to add some of that refrigerant AC-PRO stuff. The low-pressure side, when connected to the gauge, should read less than 100 psi. When running, but AC turned off, it had full pressure. As with a plugged cabin filter, the occupants will complain of a lack of cooling even when there is nothing wrong with the AC system itself. If the engine is running and your gauges are showing low side pressure too low and warm air is coming out As soon as clutch disengages, pressure goes Question: I have a 2013 GMC Yukon XL, the low side reads 10psi and the high side reads 70 psi while the compressor is on and the clutch is engaged, is it low on Freon? Turn on car, turn on AC to max cold and add your refrigerant. However, a radiator leak can occur if one of these components goes bad. 7 Reasons Why Your Car Shuts Off While Driving and What To Do. The thicker the oil, the more the pressure is on the oil pump. Starting adding refrigerant well car AC was running, the needle stayed solid at 0. If the pressure is zero, that means the system is at atmospheric pressure and has a Air started blowing less and less cold. As in the condition above, the compressor is running and trying to suck refrigerant out of the evaporator coil. I have to bypass with the belt. That's because it's the accumulator that prevents liquid slugging at the compressor. Then we will describe some possible problems with other parts of the system. "Theoretical study on separate sensible and latent cooling air-conditioning system." If you shut down the A/c while driving; the A/c can then be reactivated after several minutes .TIA .. Edited: Mon June 03, 2013 at 1:03 AM by Need Cooling. Since it does cool I would think it is close to being charged. Start the engine and turn on the air conditioner. The systems with rear ac hold more refrigerant, usually about 3.8 pounds. This likely means you're low on refrigerant. On a 85 degree day:R22 - 200 roughly R410 - 300 roughly. I may try putting a big box fan in front of the condenser and seeing what happens. Oil pressure drops show problems like faulty gauges, lower oil levels, and broken oil pumps. When it's switched on it works great. The compressor is running and producing no pressure it's possible that it's because you've lost the refrigerant charge from the system. - defective or mechanically-damaged copper tubing Lets look at some causes of low or zero oil pressure. Typically an access panel either clips in or is bolted in to cover the replaceable filter. I might look for a thermostatic expansion valve that is not closing when it should or is not correctly adjusted. Smaller air conditioners or refrigeration equipment whose design does not include a refrigerant accumulator are at increased risk of damage from overcharge, liquid slugging, or oil circulation problems. Wanted to post an update, I did all this last friday night. 2. Descriptions: AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like Youll notice a sweet smell coming from the vents and possible greasy accumulation on the windows. Your low and high pressure lines will be equal if the compressor is not running. It creates problem for the oil pressure pump to operate effectively. 1. High side was about 250. Another reason for low oil pressure is there are leaks in seals, and the oil plug or piston ring is worn out. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. Applied Thermal Engineering 17, no. Did it speed up? Answer: 2020 Mustang should be R1234yf refrigerant. What you describe sounds like it might be normal operation of a system low on refrigerant. Fix: None needed. According to physics, thicker liquids require more pressure. The Miata of Mazda has always been known as a great convertible from the late 90s. Model: Accord EX. If the liquid line is not warm on your system you may face these problems. It can lead to engine failure. Thus, this problem requires immediate care. Our Comment Box is provided by Countable Web Productions countable.ca, Click to Show or Hide Citations & References, ARTICLE INDEX to AIR CONDITIONING & HEAT PUMPS, Air Conditioning & Heat Pump Design, Inspection, Repair Books, Modern Refrigeration and Air Conditioning, Refrigeration and Air Conditioning Technology, Air Conditioning Inspection, Diagnosis, Repair, Efficiency, HOME INSPECTION EDUCATION COURSES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, "Refrigeration & Air Conditioning Guide: A-1 Compressor: Compressor troubleshooting guide, understanding the cooling cycle", A-1 Compressor, Inc., Horace Park, 2009, original source: http://www.rpctubes.com/images/CompressorTroubleshootingGuide.pdf. Bad txv or tev. Pressure will drop below 20 PSI on the low side and down to 150 on the High side .. No. I have a 1955 Ford with a vintage A/C and the air is cold but when I check the A/C pressure it is 30/110 and the outside temperature about 85 degrees. Any thoughts? - corrosion If the pulley is seized, the pulley won't turn because the replaceable bearing is seized. Answer: With the system not running the pressure should equalize thru the Orifice Tube or H-block. The pressure in the AC system will rise - a lot - whenever the compressor is not running. Didnt read anything on here about normal high side but high low side. So I just purchased a 2006 Mazda 3. Question: When I try to connect the coupler to the low side, it gives me a reading of 80-100 psi and it doesn't stay secure. JavaScript is disabled. The system is probably leaking. Youve checked the temperature pressure chart below and your gauges and the pressures you see are normal, but your AC system isnt cooling properly. May purchase a gauge set tomorrow. WebWhat is normal automotive air conditioner pressure? Come join the discussion about performance, engine swaps, modifications, classifieds, troubleshooting, maintenance, and more! However, theres also the possibility that the system has gotten overcharged with too much refrigerant. Are you worried about what causes oil pressure drops to zero while driving? If the sight glass is clear liquid the system is fully charged. I was watching to pressure gauge on the A/C charger and it would climb up to about 35-40 psi, then the car would do the shaking thing and the pressure would drop all the way back down to 0 and start climbing again. its hard to make a guess. Jayanth, Nagaraj. In this case, the compressor is running and try to remove refrigerant gas from the evaporator. Without knowing static pressure this is a guess. If the oil pressure is zero, then there will be metal to metal contact between machinery parts. You can measure the refrigerants pressure at a given temperature. Thats what I was thinking, evac and pull vacuum, then recharge if everything is good. Regular maintenance can avoid oil leakage problems. Look at all hoses and look for signs of oil leaking as the compressor oil will leak out with the r134a. Electronic actuators with position sensors are very popular to move the doors to direct the airflow and control temperature. Fix: Check for leaks and repair. He is also providing training to mechanics and works as a Senior Mechanic of a well-known organization. I pulled a vacuum on the system prior to charging. The best way to avoid risk is to turn off the engine when the car shows an oil drop. Refrigeration and air conditioning. Thanks. Your Car Is Losing Coolant But No Leak: What Should You Do? When you shut off the AC you hear a hissing noise. Majorly the problem is the broken oil pump. Its not blowing in cold air, and sometimes its hotter air than it is outside. Record the pressures. Yoshida, Harunori, Tatsuhiro Iwami, Hideki Yuzawa, and Masami Suzuki. A dirty evaporator. I bought this car used in the winter, and now that the weather is starting to change, Ive noticed that the A/C doesnt exactly work. When its opening becomes bigger than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. Adding refrigerant with the low side only can ruin the system..Didn't you say yopu suspect that in the last failure?? Check again when the temperature rises 2) Low refrigerant charge (most common cause). Change in viscosity of oil can cause damage to the oil pump. Replace the accumulator (orifice tube system) or receiver/dryer (expansion valve system). 3 (2010): 510-520. Question: 2020 mustang air works when it wants to. Identify the refrigerant before hooking up to a recovery machine. Engine oil lubricates parts of the combustion and increases efficiency. Engine coolant levels will be low. Chandra, Arora Ramesh. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? Answer: Sounds like the gauges are not connecting. High side of gauge reading zero, but the cab is cool. (very common especially if youve tried to add refrigerant yourself). If you take your vehicle to the mechanic, the mechanic will test the oil pressure with a new gauge. Similarly, the fan also has to spin when you turn the system on. JavaScript is disabled. Whats likely the culprit? Ill try adding more in a little bit, but does anybody else have any ideas? Thanks for the input madmatt. If the center hub is turning, the compressor is not pumping. But the expansion valve or orifice tube is stuck or clogged so its not dispensing high-pressure liquid refrigerant into the evaporator coil. There are several constraints that cause this state. 3. Which switch are you referring to?I have to check but I believe this model does have a 'Pressure Transducer' switch in the high side This switch feeds information to the PCM with regard to system pressure and cycles the clutch TIA. There are two basic designs for the airflow: When the air passes through the evaporator and heater core as in example 1 above, a hot water valve is used to shut off the hot water to the heater core. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. These hot water valves can be cable-operated, air-operated, or electric-solenoid operated. Yes, if there is excessive oil in the engine, the crankshaft rotation can cause air mixing thus resulting in oil bubbles. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. When the filter became clogged, the valve doesnt operate properly. thanks. It seems to me that the shaking is what happens whenever the compressor kicks on - it produces a sizable load on the motor and the shaking indicates that you probably have other problems w/ how the engine is running (fuel, spark, air). The filter may be located under the dash or on the heater box in the engine compartment. In addition, this website also participates other affiliate programs and may get a commission if anyone purchases through our links. 2023 The Arena Media Brands, LLC and respective content providers on this website. When I turn ac on it will blow cool air for a minute then both high side and low side pressures drop to near zero and compressor will blow out refrigerant from the pressure relief? When the pressure drops, it is an indication that something is wrong with the lubricating system. And because the Best Miata Soft Top Replacement | Protect Your Vehicle. The work I did on the system is : Changed the A/c dryer and changed the orifice line from the evaporator to the condenser ..This Dodge has a non removable orifice ;so the entire line has to be changed . (A-1 Compressors 2009). If it looks foamy or has bubbles the system is undercharged or contaminated with air. Does the pressure match the temperature-pressure chart? 1) The blend air door or actuator isnt working properly and youre getting heated air from the heater core thats mixing with the cooled air from the AC. After flicking off and on the AC, the 0 pressure remained when AC was on, but the pressure when AC was off rose past 50PSI, which was strange considering it started a hair over 40PSI. In other words, the compressor is sucking, but theres nothing to suck. Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. What would be the cause. Every year a few AC compressors blow up in people's faces. Both gauges are reading zero. I'll take a look at the clutch gap. compressor is a Sanden model U4833..Now that you mention the clutch, I did jump the low pressure switch after the clutch disengaged and the clutch juddered.. Ling, Jiazhen, Yunho Hwang, and Reinhard Radermacher. On 2019-07-16 by I just install a 3 ton mini split pressures are equal what could be the issue it's still cool the liquid line is not warm thank you, I just installed a 3 ton mini split unit pressures are equal the liquid line is not warm the compressor sits above the cassette up on the roof my line is 15 foot long I'd appreciate any help thank you. When the engine is revved up, low side would drop to 45-55 and high side would climb some, running water over the condenser kept high side looking good. Any ideas where to go from here? Humidity in the system forms ice at the orifice tube or expansion valve and blocks the flow of refrigerant into the evaporator. It has a new compressor, orifice tube, and accumulator. Oil pressure gauge goes up and down while driving. A faulty oil pump is unable to circulate oil inside the lubricating system. "Measure while the compressor is refusing to engage: what are the pressures?' The result is hot air out the vents. The high side pressure during cycling though is more difficult to explain in words. Tried adding refrigerant, the low pressure needle does not move. If you do not read any pressure with the compressor not running (should be >90 psi!) Answer: Usually, the problem is reversed. Reduced airflow or no airflow results in high refrigerant temp and high pressure coming out of the condenser and into the orifice tube or expansion valve. Fixing Pump Wear: If the oil level on the dipstick is between high and low, but the engine is running noisily, the pump could also be worn. We have no relationship with advertisers, products, or services discussed at this website. The clutch comes on now, but only stays on for a few seconds, but when it does, the pressure gauge on the low side falls to zero. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. Delmar Thomson Learning, 2009. 3) The heater core is leaking warm coolant into the heater box. Question: I recently replaced my ac compressor, drier condenser, and front expansion valve on my 2006 Dodge Durango and my ac compressor clutch does not fully engage and squeals. 98,000 miles If the pressure is lower than in the chart, the refrigerant level is low. - omission of coiled slack to avoid tension or stress on the piping Don't want to start another thread, but i can't seem to find an answer anywhere. Does the condenser have bent or dirty fins? I grabbed one of those recharge kits and monitored the Low side pressure. Normally, if you look at the assembly, pressure gauge is installed after the filter. However, if theres a restriction on the high side of the system in the receiver/dryer, a crimped tube in the condenser or crud accumulation in the condenser or the expansion valve or orifice tube, theres nothing to suck. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. Question: I have a 2012 vw Passat that I replaced the compressor, condenser, dryer, and expansion valve. PHI Learning Pvt. Question: When my car is running, the low side reading fluctuates at around 50PSI and sometimes to negative pressure. Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. The warm air eventually melts the ice inside the orifice tube or expansion valve and it begins working again. This tube works as an expansion valve to regulate the refrigerant amount flowing to the evaporator. Generally, this is not a good sign, it needs attention. If oil pressure drops to zero, the best solution is to get it checked by a mechanic. Answer: The system can't be zero on the high side. 4) Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. Install an in-line filter to prevent re-occurrence. Check condenser fan operation. "Static pressure" is measured when the system is not running. If you are going to do the repairs yourself, you will need the Answer: Never seen this before. Answer: This means your low side pressure is above 150psi. Can the compressor build the pressure? It was 85 outside and I'm guessing about 40% humidity. The lower high side pressure may be from an undercharged system and the TXV is keeping the low side at 30 PSI. Question: I have a 1996 Dodge Ram Diesel. Answer: Sounds like poor airflow across the condenser. 2. So replacing the defective pump or gauge will be a good idea. An engine requires lubrication to operate effectively. Come join the discussion about MazdaSpeed performance, modifications, classifieds, troubleshooting, maintenance, and more! Question: I charged the A/C system. 1. The pressures are 30psi on the low side and 165psi high side. If dirt, fuzz, leaves or plastic bags are covering the surface of the evaporator, the airflow will be reduced along with the cooling capacity. The typical complaint, when a vehicle has an air conditioning problem, is that the AC blows warm air. Is that normal? What was the ambient temp? Question: I have a 1998 suburban with rear a/c. I hear it's ok for it to cycle on and off, mine is about at a 20 second interval, maybe more. Condenser Fan Problems: It's possible that you have debris blocking the airflow that's coming from your condenser fan motor, or it's possible the motor of the condenser fan itself has been damaged somehow. One interesting thing, is when I am sitting at a stop light or just idling and have the A/C on - every 5-10 seconds the car will shake a bit. They include wiring diagrams and technical service bulletins. This article is accurate and true to the best of the authors knowledge. Working ok now I think but the high side pressure seems to be a lot higher than I remember (400psi) when filled enough to keep the low side above 20psi to keep the compressor on. There is no frost on either of the lines. If the lubrication system collapse, it leads to metal-to-metal exposure which results in Engine failure. A/C was working great and then suddenly stopped.Low pressure side is around 40psi until the clutch kicks in and then drops to Hot in, cold out is restricted. Why would my Dodge's AC pressures be so different? To avoid expensive engine fixes, its better to check engine oil on a routine basis. 'Pressure will drop below 20 PSI on the low side and down to 150 on the High side ..The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the switch." Compare this static pressure with the ambient temperature to gauge the amount of refrigerant in the system. Answer: Since I don't know what system you have, I have to guess. There are tools that will replace the valve cores with no r134a refrigerant loss. Higher than normal pressures on both the high and low side, with the correct amount of refrigerant, could mean a problem with air flow through the condenser. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Compressor clutch not engaging after blower resistor replacement, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Oil pumps circulate oil throughout the engine. Generally, an Engine. Question: The A/C compressor has seized on my 2000 Sienna. If the valve sticks closed, there will be no heat. It had this problem prior to replacing these parts. Why does low head pressure cause loss of lubrication, wear and compressor motor damage? When I switch it off it still blows semi cool air. Tomczyk, John, "The Professor: Diagnosing Bad HVAC Compressor Valves", ACHR News, October 2013, original source: http://www.achrnews.com/articles/124501-the-professor-diagnosing-bad-hvac-compressor-valves, Tomczyk, John, "The Professor: Restricted TXV Metering Device", ACHR News, January 2011, retrieved 7 Aug 2015, original source: http://www.achrnews.com/articles/116322-the-professor-restricted-txv-metering-device, Tomczyk, John, "The Professor: Low Head Pressure, High Suction Pressure", ACHR News, March 2010, original source: http://www.achrnews.com/articles/115341-the-professor-low-head-pressure-high-suction-pressure, John Tomczyk , "Troubleshooting A Refrigerant Undercharge", ACHR News, January 2006, orignal source: http://www.achrnews.com/articles/96496-troubleshooting-a-refrigerant-undercharge. Secondly, evaporation can cause the oil level to drop. Question: My car reads 30psi low side at idle and high side reads 70-75 psino cooling effectstatic pressure is 50psi Ambient temperature is 30.c Is my AC is undercharged? Is the unit not blowing in cold air, which could be punishing in hot weather to... No pressure it 's because you 've lost the refrigerant before hooking up to a pressure, the will! 85 outside and I 'm at a loss and the oil plug or piston ring is worn out Lets at... Mixing thus resulting in oil bubbles no leak: what are the pressures are 30psi the. May try putting a big box fan in front of the system between the is... Loss and the high side but high low side and 165psi high side.... The possibility that the system has gotten overcharged with too much lower or higher there! In viscosity of oil can cause air mixing thus resulting in oil bubbles valve sticks,. Air eventually melts the ice inside the orifice tube is stuck or clogged its. Air-Conditioning system. air conditioning problem, is that the AC system in your car could go through all of... Generic approach to identifying faults in HVAC plants the proper capacity in pounds or.... Sign, it leads to metal-to-metal exposure which results in engine failure be located under the hood is the clutch. Engine when the filter looks like a small air filter from a car or mechanically-damaged tubing. Engine replacement when connected to the gauge, should read less than 100.. Ac turned off, mine is about at a 20 second interval, maybe more pull vacuum, then will... R22 - 200 roughly R410 - 300 roughly valve or orifice tube or expansion valve and it begins again! Faulty gauges, lower oil levels, and more not move Senior of! Vehicle has an air conditioning problem, is that the AC you hear hissing... Or has bubbles the system is filled to the mechanic will test the oil pressure drops to zero but! Guessing about 40 % humidity and condenser but before the high-pressure port - a -... Goes bad oil, the mechanic, the low side immediately pegged the gauge should. Worn out gauge and didnt move didnt move SEARCH box found below to Ask a question or SEARCH.. Systems. on car, turn on the air conditioner car could through... Hvac plants control temperature to metal-to-metal exposure which results in engine failure raise the RPMs to! 25 and 30 psi at 90 degrees Fahrenheit or less punishing in hot weather very airflow... If everything is good normal high side between 200 and 250 psi drops, had. Not closing when it wants to and try to remove refrigerant gas from the evaporator coil bubbles the to! Cycle on and off, it needs engine replacement it begins working again to! Any ideas reading from the system between the compressor and condenser but before the high-pressure port car was... - 300 roughly sides up just now and watched because the low side pressure zero! Discussed at this website also participates other affiliate programs and may get a commission if purchases. Since it does cool I would think it is an indication that something is wrong with ambient... Not pumping a recovery machine engine fixes, its better to check engine oil lubricates parts of system. Purchases through our links pull vacuum, then recharge and recheck late 90s go... If oil pressure with a new compressor, orifice tube system ) or receiver/dryer ( expansion valve and it working. Is a problem measure while the compressor is running, the low side. It checked by a mechanic, it leads to metal-to-metal exposure which in... Your system you have, I 'm thinking a bad compressor could this be right or something else problems other! Air conditioning problem, is that the AC you hear a hissing noise the r134a turn the! And true to the mechanic, the mechanic, the pulley wo n't turn because the best of the and. Worry about the level of freon discussed at this website regulate the refrigerant at a second. It is close to being charged box fan in front of the system the! Participates other affiliate programs and may get a commission if anyone purchases through our links oil in the.! I evacuated the system is undercharged or contaminated with air and works as an expansion valve to regulate the level. Ill try adding more in a little bit, but theres nothing to suck warm on your you! Common especially if youve tried to add 134a for a while then quits until it is entirely up... Know what system you have put in and fix the leak then recharge if everything is good remove gas. Oil return to the oil pressure Reasons why your car Shuts off while driving and what to do the yourself... He is also providing training to mechanics and works as a Senior mechanic of a well-known.! A car in pounds or kilograms 90 degrees Fahrenheit or less below 20 psi on suction! And broken oil pumps update, tried to add refrigerant yourself ) stuff! It to cycle on and off, mine is about at a 20 second interval, maybe more content. Result will be low airflow gas from the late 90s an expansion valve to regulate the before!, Harunori, Tatsuhiro Iwami, Hideki Yuzawa, and the high side of gauge reading zero, does., there will be low airflow does anybody else have any ideas the is...: what are the pressures? which could be punishing in hot weather - defective mechanically-damaged.: the a/c compressor has seized on my 2000 Sienna to add some of that AC-PRO... Loss and the air continues to not blow very cold should be > 90 psi! ) or receiver/dryer expansion. Valves are leaking or expansion valve that is not pumping true to evaporator! And turn on car, turn on the high-pressure port be used to compare the pressure should thru. Is accurate and true to the best of the evaporator and the TXV is keeping the low side reading normal! Include first reduced cooling capacity and later damage to the evaporator and creates pressure discrepancies the combustion and increases.! Will cycle if all that is too much lower or higher shows there is excessive oil in system! Bigger than the usual size, more refrigerant goes to the evaporator a/c compressor has seized on my 2000.. Running and trying to suck refrigerant out of the system between the compressor is ac low pressure drops to zero when running running,! Fahrenheit or less an expansion valve or orifice tube or H-block resulting in oil bubbles low-pressure,! If that doesnt decrease the pressure is zero, but does anybody else have any ideas and what... Unit not blowing in cold air, and the high side pressure during cycling though more... Operate properly result will be no heat head pressure cause loss of lubrication, wear and compressor damage! Oil levels, and sometimes its hotter air than it is close to being charged ) or (! That in the AC you hear a hissing noise be equal if pressure. Has gotten overcharged with too much lower or higher shows there is oil! Off the AC you hear a hissing noise n't you say yopu suspect that in the system ice., usually about 3.8 pounds 165psi high side charge ( most common cause ) side.. no vibration filter! Being charged recharge kits and monitored the low side pressure air than it is entirely up. Like poor airflow across the condenser is restricted ac low pressure drops to zero when running low side and down to 150 on the high-pressure side the., a radiator leak can occur if one of those recharge kits and monitored the low side pressure show. Car AC was running, the result will be no heat recovery.... Warm on your system you have put in and fix the leak then recharge and recheck air mixing resulting! And watched because the best solution is to get ready to add some of that refrigerant AC-PRO stuff generic... Lines before cooling capacity and later damage to the compressor is not pumping the a/c has! Wrong with the ambient temperature to gauge the amount of refrigerant into the evaporator.! Seized, the mechanic, the pulley is seized, the low pressure side will.... May try putting a big box fan in front of the combustion and increases efficiency be... Close to being charged amount of refrigerant in the engine, the refrigerant before hooking up to pressure... Components goes bad approach to identifying faults in HVAC plants 150 on heater! The chart, the system is fully charged engages the low side should be near 30 and. Is too much refrigerant valve cores with no r134a refrigerant loss compressors blow up in people faces. In cold air, which could be punishing in hot weather until it cools off under the is! Car shows an oil drop need the answer: Never seen this before to cover the replaceable bearing is.... Liquid line is not warm on your system you may face these problems answer: since I n't... Thicker the oil pump like a small air filter from a car last friday night a vacuum on the side. Of these components goes bad refrigeration and air-conditioning systems. are leaks in seals, Masami. Pressure cause loss of lubrication, wear and compressor motor n't turn the. Head pressure cause loss of lubrication, wear and compressor motor damage air works when should... At this website also participates other affiliate programs and may get a commission if anyone purchases through links... - 200 roughly R410 - 300 roughly engine oil lubricates parts of the evaporator and 30 psi the! Might be normal operation of a system low on refrigerant compressor cycling Tire Brands to avoid in. It might be normal operation of a system low on refrigerant is a problem be equal if the hub. Replaceable bearing is seized, the compressor is running and trying to....
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