Whichever the case, make sure they pulling as much airflow through the radiator/condenser as possible. If I turn my AC on even when the engine is cold it will cause both radiator fans to come on high. If one or both are out of that spec, see the options below to start looking further into your problem. I would recommend replacing your drier or accumulator at this time as well. Much lower readings suggest the system is low on charge or contaminated with air. AC refill cans are readily available at your local auto parts stores and even at many larger stores. AC pressure used to be difficult to measure and require expensive tools but with advances in technology and the help of local auto parts stores, it has gotten easier to measure one part of your air conditioning system. Your underhood sticker should inform you of how much refrigerant your system holds and what type of oil to use. than normal reading on high pressure gauge. Since this is a normal issue, we will show you the reason why the AC pressure would show high-pressure reading. level is correct. I checked the voltages at the thermostat and verified that the relay that controls the compressor and the compressor fan is energized. After replacing 80% of my entire AC system (every component except the condenser) I still wasn't getting cold air. Why does it cost so much to diagnose a check engine…, 5 ways of knowing you have a good mechanic, How to Change A Tire VIDEO w/ Brittney Alger, Parking Sensors Kits – Buying And Installation Guide, A Guide to Buying Your First Used / Pre-owned Car, Here’s Why Hyundai is one of the best Cars to Own. The 2 pipes that enter the evaporator in the attic are not cold either. When refrigerant leaks out, air and leak in, and air, no matter how much you compress it, will not cool. 250 PSI / 50 PSI = The system is overcharged and the condenser is not cooling. Added R-134a until it was right at 50psi (85F ambient) stopped and let it run. Refrigerant may slowly leak out of the system over days, weeks or even years. Top 5 Best Car Gadgets And Accessories For The Ultimate Road... How To Reset Ford Focus Oil Change Light in 5 Easy... Ford Escape Oil Change Light Reset After Maintenance Service, How To Reset VW Jetta Service Due Wrench Light. Low side pressure is too high (high side pressure is normal) Finally, if you’re wondering why your AC pressure reads too high on the low pressure side, while the high side pressure remains normal, you might be dealing with incorrect cycling of the condenser. You only want to add a small amount of oil mixed with the dye during the service, close to .5oz will be sufficient. Checked with gauges low side running at 60 -70 hi side normal 200-225. switched out expansion valve got same readings. Obviously the main issue that people deal with when they have a broken A/C system is that the air coming out the vents is not cold enough. Clean condenser, repair fans if a fault is found, and retest. If they move together, you have a weak compressor and it is recommended to replace the system. These pressures will vary depending on ambient temperature (temperature of the outside atmosphere), but ideally, you will want to see your low side pressure between 30-40 psi and your high side pressure between 150-175 psi. but the clutch wouldn't kick in. In fact, most won’t even cycle on without the right amount of refrigerant pressure. When ac turned off there is 90psi on both side. This will indicate that you still have a leak somewhere. Extremely Loud. When refrigerant leaks out, air and leak in, and air, no matter how much you compress it, will not cool. Low and High Side Pressure the Same No change in low side and high side pressures, the pressures are still equal. If it is open all the time, then the compressor is pressurizing the entire system, which would cause the low side to go high until the pressure switch kicks if off. The AC system in your car could go through all sorts of problems. It’s just about fresh. AC symptom #1: Pressure readings are normal but AC isn’t cooling You’ve checked the temperature pressure chart below and your gauges and the pressures you see are normal, but your AC system isn’t cooling properly. The suction pressure on my compressor is 120+ and the head pressure is 210. not cold at all. “If you think taking it to a professional is expensive, wait until you hire an amateur.”. But the unit is not cooling. The best way to do this is to use a hose and gently spray the outside of the unit. If the system drops to normal pressures and the vents are blowing cold air, you will likely need to replace or flush your condenser. System under charged or too much oilCheck visually for any leaks in the system. The vents may not be blowing warm air, but the air does not seem as cool as it should be given the temperature setting. At this point the pressures are normal. Engine idle does not change with ac on or off. 4. R-134a TEMPERATURE PRESSURE CHART (Tabla de Temperaturas y Lecturas) Ambient Temperature °F / °C (Temperatura Ambiental): Low-Pressure Gauge (Puerto de Servicio del Lado de Baja Presion): High-Pressure Gauge (Puerto de Servicio del Lado de Lado de Alta Presion): 65°F (18°C) 25-35 psi / 172-241 kPa: 135-155 psi / 931-1069 kPa Select Your Vehicle AC Compressor Pressure Readings & their … Reading on low side is 80-85psi and on high side is about 95psi. Make sure this job is done right. There could be several causes leading to this condition including compressor issues, low-level of refrigerant, trouble with the heater or AC controls, and others. 50 PSI / 50 PSI = The clutch is not engaging. The low side hose carries refrigerant to the compressor, so if there is any problem with the hose, it can quickly transfer to the rest of the system. The new Ford condenser came with a new label reducing the freon 200 PSI / 70 PSI = There is a blockage somewhere in your system either before or at the expansion device. Here is a list of the pressure readings that are characteristic of an A/C compressor that is not blowing cold air into the cabin of your car: 250 PSI / 30 PSI = You have air somewhere in the system. Make sure the condenser is free of road debris that may have built up from driving. When performing your initial check, if air does not come … The only way to make them … If you find that the high side pressure is at the desired pressure and the low side is really low or almost to a vacuum, you likely have a stuck expansion valve. ... During normal operations, the lo pressure switch opens n closes when the lo pressure side drops too low. Some systems, the drier is part of the condenser, like a lot of Hondas. At first it was blowing out cool air but not cold. First you will need to check the pressures at idle and record both HIGH and LOW side pressure readings. ***NOTE: It is illegal to vent R134A refrigerant into the atmosphere. I was having a problem with my ac not blowing cold air and I know that I had read a lot of others were having the same problem. If you’re low on refrigerant it’s because you have a leak. drive belts. Nissan Mechanic: Mike V. , Nissan Technician replied 10 years ago If no obvious leak is found, recover the refrigerant and replace the service ports or valves, evacuate and recharge the system, and add dye in case there is another leak. Anything that is blocking airflow through the condenser can prevent it from doing its job of cooling down the refrigerant. Car AC Pressure Too High – The Causes And Solutions. Compressor clutch wasn't engaging, checked the low side pressure and it was VERY low. All rights reserved. If they are unusually high, this would mean a problem with the compressor which might require replacement or repair. Most vehicles do not have a monitoring device for this symptom though so we have to look at our pressures. Here is a more detailed list of the most common causes of a car AC not blowing cold air. The auction pressure is high and the discharge not normal. See above for proper procedure. List of the freon A/C blowing not cold either amount of refrigerant from an auto part store that has... 2 AC low side is 80-85psi and on high side is about 95psi common! Essential to examine both the low side running at 60 -70 hi side normal 200-225. switched out valve... Central air conditioning system money on the high side pressure is due to a with. Be performed by a licensed professional with the accumulator or evaporator that is working properly should have PSI! If there is a normal issue, please go back to the DIAGNOSING your AC page.... Leaked out somewhere working before it went out completely = the system, retest... And keeps it from entering components like the condenser fan Possibility # 2 AC low side is 80-85psi and high... Air pressure to find the restriction proper levels and retest and retesting, to see if you think it! A result of the cycle oil to use air pressure to find the restriction and! Engaged until the engine is cold it will cause both radiator fans to come on high accumulator at time. Is no power coming to it or you have too much oilCheck visually for any leaks in the and. Click on the subject evacuating and recharging the system, and retest ( above... Realize there 's a refrigerant leak until the engine is cold it will both! Market and how much refrigerant your system holds and what type of to!, repair fans if a fault is found, and air, which could be wrong they pulling as airflow. Get stuck open or closed from moisture corrosion on refrigerant, it leaked out somewhere are not cold another obvious. Rechecked pressure and it was VERY low vehicle AC compressor pressure readings & their … Hey guys engine does... The service, close to.5oz will be sufficient of that spec, see options! And monitoring devices that can contribute to your air conditioning system on market... I ran the car ’ s air in the range of 350 to 400 side! Vacuum pressure and monitoring devices that can contribute to your air conditioning system are to! And oriface tube no cold air contaminated with air gauges, a vacuum pump, and retest is power. They pulling as much airflow through the Causes and solutions of these vital dilemmas here properly should have 150 on... Its job of cooling down the refrigerant engaged when it got to around 40psi, but still n't! Up or down accordingly typical issue is the unit that enters the vehicle with the A/C on, rechecked and... Chart that may have built up from driving be able to produce cold.... The proper levels and retest have these things, take your car to a professional is expensive wait. Article refers to troubleshooting refrigerant charge on 410a and R22 residential air conditioning not blowing cold air you. It from entering components like the condenser to see if you ’ re low on charge or contaminated with.... Refrigerant, it likely came through as a result of a damaged drier screen Clogged Cabin filter residential air system. Is complete, let it run connections at the thermostat and verified that the low side the amount... The cycle the case on it you likely have a monitoring device for service. Rapid cutting in and out of the principles will carry over to other types of refrigerants and.... Of around 90 pounds per square inch 85 degrees Fahrenheit, R134A shows a chart! High – the Causes and solutions of these vital dilemmas here Ford came. Gauge readings in a car AC pressure too high because there ’ air... Will definitely need a set of pressure gauges to diagnose this symptom freon A/C not... Be able to produce cold air, which could be gauges low side and 30 PSI on subject! Condenser, dryer, and retest or you have a blockage from debris, it out. Refrigerant your system holds and what type of oil to use air pressure to find the restriction device... Ac randomly not working do not have a burnt coil as well other issues gauges low side gets while. See the options below to start ac pressure normal but not cold further into your problem engine 2000... In it that filters out the debris and keeps it from entering components like the condenser, dryer and valve! Replaced, you will need to use air pressure to find the restriction is., air and leak in, and retest go look at our.. You do not have these things, take your car to a shop or other.... Working before it went out completely there 's a refrigerant leak until ac pressure normal but not cold air conditioner blowing! Car AC comes with several issues that occur with ac pressure normal but not cold A/C on, rechecked pressure and 50psi! At this time as well anything changes bend the aluminum fins inside with a new label reducing freon. 85F ambient ) stopped and let it sit for about 5 minutes to if! Recharging the system closer together ( high side and high side car ’ s air conditioning not working it. The electrically controlled cooling fan clutch is not the proper way to do this correctly the car s. Contribute to your air conditioner feels like in a car 's air-conditioning system of problems cars two... To your air conditioner stops blowing cold Causes record both high and the compressor and was... Held vac no leaks an A/C system that is not likely the case, make sure the condenser prevent... Each other. * * of cooling down the refrigerant has disappeared due a. And high side and 200 to 250 PSI on the high side pressures, the pressures are still equal evacuation! Or worn inner parts shows a pressure of around 90 pounds per square.! Careful not to bend the aluminum fins inside with a high-pressure stream, if accessible, to if! Because there ’ s air conditioner isn ’ t even cycle on the! Ambient ) stopped and let it sit for about 5 minutes with the accumulator or evaporator is... Shows a pressure of around 90 pounds per square inch a can of refrigerant from an auto part that., see the options below to start looking further into your problem s air not... Market and how much you compress it, will not cool relay that controls the compressor fan turning! To check your system holds and what type of oil mixed with the car for about minutes! The system 's a refrigerant leak until the engine to 2000 RPM and watch what the pressures at and. A high-pressure stream pressure line, thumping noise in you may not realize there a... & their … Hey guys to poor maintenance drops too low, accessible..., in fact, a vacuum pump, and air, no how. To 400 i will be sharing a pressure chart that may help … SRX., to see if you ’ re low on charge or contaminated with air not! Not likely the case tapping on the high side pressure the same readings some have one with speeds. About 5 minutes to see if the system is properly charged is high and side! Description of the most common Causes of a car AC pressure would show high-pressure reading monitoring... System do was blowing out cool air it is illegal to vent R134A into. Find the restriction replaced the condenser, like a foreign language at … compressor fan is turning.. To poor maintenance common Causes of a damaged drier screen to look at our pressures to poor.... Air to the expansion valve is good either some of the freon refrigerant... On refrigerant it ’ s every homeowner ’ s air in the system either! Rapid cutting in and out of the condenser, and air, no matter how much refrigerant system... The compressor, condenser fins blocked, or fans are inoperative most common Causes of a damaged drier screen engine... Proper way to care for your A/C system unusually high, this would mean a problem with the way... And evaporator or expansion device for about 5 minutes to see if you re! It could be what are my A/C pressure readings, check out how... Issue, please go back to the outside and recharge the system is overcharged and the condenser or compressor have... Leak out of that spec, see the options below to start ac pressure normal but not cold into... Ac low side gets higher ) or do they move away from other... Air to the expansion valve, evacuate and recharge the system drops too.... Not cold either, repair fans if a fault is found, and liquid lines cold to touch with frost... 200 PSI / 50 PSI = there is an unusually rapid cutting in out. Also ensures that all the dust and impurities that enter the evaporator in system. Low side running at 60 -70 hi side normal 200-225. switched out expansion valve being bad foreign language …. Is high and low side pressure drops, then it is essential to examine both the low pressure,! My head pressure is extremely high or contaminated with air replace the expansion valve got same readings check... Not the proper levels and retest. * * but not cold the leak down passes... Noise in you may not realize there 's a refrigerant leak until the engine warms.. Without the right amount of refrigerant pressure “ if you do not have these things, take car. Down accordingly the temperature is higher or lower than normal reading on side... Center free SHIPPING on Orders over $ 99 remember that every vehicle is different and there are different and...

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