Compressor fan is not blowing warm air to the outside. When refrigerant leaks out, air and leak in, and air, no matter how much you compress it, will not cool. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. Actual pressure will depend on the type refrigerant and the ambient temperature and does not show if the system is properly charged. AC Compressor Pressure Readings may look like a foreign language at first, but with this guide you will be able to understand them in no time. Car AC Pressure Too High – The Causes And Solutions. System under charged or too much oilCheck visually for any leaks in the system. Do they move closer together (high side gets lower while low side gets higher) or do they move away from each other? This happens when there is an unusually rapid cutting in and out of the cycle. 12. This is not the proper way to care for your A/C system! The AC system in your car could go through all sorts of problems. 3. 250 PSI / 50 PSI = The system is overcharged and the condenser is not cooling. 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. When refrigerant leaks out, air and leak in, and air, no matter how much you compress it, will not cool. I mean it's still cool but not cold cool... anyways I want to check and see if the freon (R134a???) Nissan Mechanic: Mike V. , Nissan Technician replied 10 years ago Once the vacuum is complete, let it sit for about 5 minutes to see if you lose vacuum pressure. The suction pressure on my compressor is 120+ and the head pressure is 210. This means, do not use a can of refrigerant from an auto part store that only has one gauge on it. How to Replace Rear Disc Brakes Pads & Rotors, How to Perform Front Brakes – Demonstrated on a 2005 Nissan…, Video Reset Wrench Service Due Message on 1998-2005 Mercedes ML320, Video Reset Change Engine Oil Light on 2002-2007 Buick Rendezvous, How to diagnose electrical issue with AC compressor. When performing your initial check, if air does not come … Low refrigerant level or failing compressor. AC Compressor Pressure Readings may look like a foreign language at … It should be in the range of 350 to 400. Added R-134a until it was right at 50psi (85F ambient) stopped and let it run. 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. You can try pouring water over the condenser to see if the pressures drop and the air gets cold. Compressor clutch wasn't engaging, checked the low side pressure and it was VERY low. The filter catches all the dust and impurities that enter the passenger compartment and can, therefore, become clogged over time. If only the high side pressure drops, then it is time to go look at your expansion block. With the gauges connected, rev the engine to 2000 RPM and watch what the pressures in the AC system do. 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. If you are low on refrigerant, it leaked out somewhere. I have the same issue. The best way to do this is to use a hose and gently spray the outside of the unit. You only want to add a small amount of oil mixed with the dye during the service, close to .5oz will be sufficient. I replaced the low pressure switch and still no AC. The electrically controlled cooling fan clutch is not engaged until the engine warms up. The most common causes when car AC is not blowing cold air are an empty AC system, faulty air compressor, faulty AC pressure switch, and a clogged cabin filter. but the clutch wouldn't kick in. The 2 pipes that enter the evaporator in the attic are not cold either. Refrigerant may slowly leak out of the system over days, weeks or even years. 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. Reading on low side is 80-85psi and on high side is about 95psi. If there is still an issue, please go back to the DIAGNOSING your AC page HERE. After replacing 80% of my entire AC system (every component except the condenser) I still wasn't getting cold air. I would recommend replacing your drier or accumulator at this time as well. 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. If the ambient temperature is higher or lower than normal (70 to 80°F) the pressures will go up or down accordingly. Okay, you will need to use air pressure to find the restriction. Check both the condenser and the evaporator. 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. It is likely that the problem is … So you will definitely need a set of pressure gauges to diagnose this symptom. If you’re low on refrigerant it’s because you have a leak. An A/C System that is working properly should have 150 PSI on the high side and 30 PSI on the low side. I have a 2010 F150 4.6 L and my AC clutch will not Engage. 100 PSI /100 PSI = The compressor is not engaging because there is no power coming to it or you have a burnt coil. Some vehicles have sensors for specifically detecting if the evaporator is getting too cold, causing the refrigerant to literally freeze inside the evaporator, halting the flow, resulting in a loss of cold air. AC refill cans are readily available at your local auto parts stores and even at many larger stores. 200 PSI / 70 PSI = There is a blockage somewhere in your system either before or at the expansion device. 150 PSI / 30 PSI = There is water in the system. The drier has a screen in it that filters out the debris and keeps it from entering components like the condenser or compressor. 125 PSI / 30 PSI = The system is either not charged enough or you have too much oil in the compressor. 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. Excessive moisture in system — indicated by excessive head re aauqe reading. Make sure the condenser is free of road debris that may have built up from driving. AC Problems a Professional Should Solve. A cabin air filter is responsible for filtering the air that enters the vehicle’s air conditioning system. 800-401-6762 Support Center FREE SHIPPING On Orders Over $99 . If after the evacuation and recharge you are finding yourself with the same readings, you likely have a blockage in the system. 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. ... Air conditioner not as cold as it could be? Some vehicles, like a lot of Fords and Chevys, will need the condenser and/or manifold lines replaced because they are difficult to flush debris from because of the way they are designed. Read More If they are unusually high, this would mean a problem with the compressor which might require replacement or repair. Both air and moisture, if left in the system, can cause corrosive damage to lines and other components as well as wear down the compressor setting you up for premature failure and a lot more money. I would not assume the new expansion valve is good either. 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 cas… Although many of the principles will carry over to other types of refrigerants and drop-ins. Air Conditioning and Cooling Systems - Central A/C not cooling but freon pressure is OK - I have a 14 year old central A/C with Lennox model H25-311-P1 compressor. Lack of Refrigerant– Your SRX’s air conditioner will not work if the refrigerant has disappeared due to a leak. AC hi on low pressure side no cooling-fixed I have a 2000 beetle tdi. The main issues that occur with the car’s air conditioning system are due to poor maintenance. Standing pressure actually makes me go back to the expansion valve being bad. not cold at all. okay, my air conditioner stop working. 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. 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. If you would like specific advice on your vehicle, please check out our Ask A Mechanic section HERE and one of our ASE certified technicians can assist you further! Be careful not to bend the aluminum fins inside with a high-pressure stream. A car AC comes with several issues that require appropriate consideration. Okay, you will need to use air pressure to find the restriction. When ac turned off there is 90psi on both side. freeze-up) ... Air conditioning system will not turn on High Low Poor to no cooling system pressure equalizes very quickly At this point the pressures are normal. - A/C blowing not cold air. Noisy clutch. Engine idle does not change with ac on or off. Low and High Side Pressure the Same No change in low side and high side pressures, the pressures are still equal. If at any part of the system, the pressure is not at it’s desired PSI, the refrigerant may not get cold enough, or cold at all. Replace items, evacuate and recharge, and retest. The temperature is skyrocketing and your air conditioner isn’t blowing cold air.. When done, run the vehicle with the gauges still connected and record new pressures. 160 PSI / 10 PSI = It is possible that the evaporator is frosted, the low pressure piping is faulty, or the expansion valve might be clogged. The AC system in your car could go through all sorts of problems.One typical issue is the unit not blowing cold air, which could be punishing in hot weather. This also ensures that all the air has been removed from the system. Click on the image to get a detailed description of the gauges needed to check your system. Refrigerant is a gas that changes states through pressure which is also how it changes temperature. Cadillac SRX Air Conditioning Not Blowing Cold Causes. 50 PSI / 50 PSI = The clutch is not engaging. It could also be the issue. If you do not have these things, take your car to a shop. Remember that every vehicle is different and there are different controlling and monitoring devices that can contribute to your air conditioning not working. You might not think your filter contributes to … i thought by adding refrigerent would fix it. What are my A/C pressure readings telling me about my A/C system. drive belts. 150 PSI / >10 PSI = Your expansion valve might be stuck open, or there could be a leak somewhere you in your system. At first it was blowing out cool air but not cold. 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. I have replaced the condenser, dryer, and oriface tube. You can try tapping on the expansion block, if accessible, to see if anything changes. If not, your AC will struggle to cool your home. This article refers to troubleshooting refrigerant charge on 410a and R22 residential air conditioning systems. 225 PSI / 80 PSI = It is likely that the expansion valve is opened too wide (not the case if your A/C system has an orifice tube) Also, you could have too much refrigerant in the system. With a cold engine, my head pressure is extremely high. Most high-pressure readings are a result of the freon or refrigerant not cooling adequately. lower than normal reading on low pressure gauge, and liquid lines cold to touch with possible frost. Hey guys. It’s just about fresh. When I turn on a/c the clutch engages and there is a very little cool air coming from the fan but it is far from being cold. If I turn my AC on even when the engine is cold it will cause both radiator fans to come on high. It’s every homeowner’s worst nightmare. Make sure this job is done right. If they move away from each other, start with evacuating and recharging the system and retesting. Have You Been Changing Your Furnace Filter? You need gauges, a vacuum pump, and a scale to do this correctly. 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 One typical issue is the unit not blowing cold air, which could be punishing in hot weather. Pressure 805 13th Street North Humboldt, IA 50548 1-800-806-5312 ... Normal to Low Normal Cooling good initially then warms and air flow decreases (evap. Why do automotive mechanics charge so much? Anything that is blocking airflow through the condenser can prevent it from doing its job of cooling down the refrigerant. In fact, most won’t even cycle on without the right amount of refrigerant pressure. If there is, in fact, a blockage from debris, it likely came through as a result of a damaged drier screen. than normal reading on high pressure gauge. I would not assume the new expansion valve is good either. No air comes out of the dash vents. Mechanics often misdiagnose high-pressure gauge readings in a car's air-conditioning system. Evacuation should be done with a proper vacuum pump that can bring the system down to at least 29.75 “hg (inches of mercury) or more and hold it there for at least 30 mins. 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. 250 PSI / 50 PSI = The system is … If you’re low on refrigerant it’s because you have a leak. Hey guys, I have a 2007 Tundra 5.7L and lately the AC is not as cold as I remembered it. Checked with gauges low side running at 60 -70 hi side normal 200-225. switched out expansion valve got same readings. Pulling the system down to a vacuum reduces the boiling point and any moisture in the system is then boiled and turned into a vapor to be removed. 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. AC refill cans are readily available at your local auto parts stores and even at many larger stores. If it is blowing cold now… go enjoy the cool air! 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. An AC system is a closed system. 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. This will indicate that you still have a leak somewhere. The auction pressure is high and the discharge not normal. 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. Your underhood sticker should inform you of how much refrigerant your system holds and what type of oil to use. The ac suddenly was blowing warm. Some cars have two fans, some have one with multiple speeds, while others have a fan clutch. For more information on Interpreting AC Pressure Readings, check out our How To page on the subject. Select Your Vehicle AC Compressor Pressure Readings & their … This quit few days ago. See above for proper procedure. And before anyone says anything, I know what a normal air conditioner feels like in a car. If one or both are out of that spec, see the options below to start looking further into your problem. I checked the voltages at the thermostat and verified that the relay that controls the compressor and the compressor fan is energized. System overcharged or air in the system, condenser fins blocked, or fans are inoperative. Evacuate and recharge the system to the proper levels and retest (see above). Is the problem with the compressor? If you think that you have an issue with your A/C system but you are not sure which component is causing the malfunction it is a good idea to hook your compressor up to a pressure gauge. But the unit is not cooling. ... 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