Cadillac SRX Air Conditioning Not Blowing Cold Causes. Hey guys, I have a 2007 Tundra 5.7L and lately the AC is not as cold as I remembered it. 150 PSI / >10 PSI = Your expansion valve might be stuck open, or there could be a leak somewhere you in your system. Check the evaporator, piping, and expansion valve to locate the source of the issue. Check both the condenser and the evaporator. 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. The temperature is skyrocketing and your air conditioner isn’t blowing cold air.. Clean condenser, repair fans if a fault is found, and retest. 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. If you do not have these things, take your car to a shop. It should be in the range of 350 to 400. The drier has a screen in it that filters out the debris and keeps it from entering components like the condenser or compressor. One typical issue is the unit not blowing cold air, which could be punishing in hot weather. Once the vacuum is complete, let it sit for about 5 minutes to see if you lose vacuum pressure. 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. AC refill cans are readily available at your local auto parts stores and even at many larger stores. Nissan Mechanic: Mike V. , Nissan Technician replied 10 years ago At 85 degrees Fahrenheit, R134A shows a pressure of around 90 pounds per square inch. 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. If you are low on refrigerant, it leaked out somewhere. ... Air conditioner not as cold as it could be? okay, my air conditioner stop working. At this point the pressures are normal. AC hi on low pressure side no cooling-fixed I have a 2000 beetle tdi. See above for proper procedure. You might not think your filter contributes to … Higher Power Bills Than Usual If your AC has to run longer or ends up running constantly trying to get the temperature down, you will be able to notice an abnormal spike in your energy consumption over a month. Actual pressure will depend on the type refrigerant and the ambient temperature and does not show if the system is properly charged. I will be sharing a pressure chart that may help … Refrigerant is a gas that changes states through pressure which is also how it changes temperature. Look for oil residue around the hose ferrules, fitting connections at the compressor, condenser, and evaporator or expansion device. Click on the image to get a detailed description of the gauges needed to check your system. Okay, you will need to use air pressure to find the restriction. Some systems, the drier is part of the condenser, like a lot of Hondas. Be it the car AC pressure too high, not cooling properly, or other issues. If you are looking at pressures around 225psi on the high and 80psi on the low, it would be a safe bet to replace the expansion device, evacuate and recharge system, and retest. I have the same issue. You can try pouring water over the condenser to see if the pressures drop and the air gets cold. Your Account . 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. Warning: Do not attempt to troubleshoot refrigerant charge on central air conditioning units unless you are EPA 608 type II Certified. 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. If one or both are out of that spec, see the options below to start looking further into your problem. Check both the condenser and the evaporator. 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. Although mechanics tell owners that the high pressure is due to a problem with the accumulator or evaporator that is not likely the case. Engine idle does not change with ac on or off. pressure line, thumping noise in Significance of AC Reading It is essential to examine both the low as well as high reading of the AC. Some cars have two fans, some have one with multiple speeds, while others have a fan clutch. 150 PSI / 30 PSI = There is water in the 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. Have You Been Changing Your Furnace Filter? All rights reserved. What are my A/C pressure readings telling me about my A/C system. ***NOTE: It is illegal to vent R134A refrigerant into the atmosphere. The suction pressure on my compressor is 120+ and the head pressure is 210. The auction pressure is high and the discharge not normal. When ac turned off there is 90psi on both side. Evaporator frosting or expansion valve faulty. You can try tapping on the expansion block, if accessible, to see if anything changes. I mean it's still cool but not cold cool... anyways I want to check and see if the freon (R134a???) 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. 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! than normal reading on high pressure gauge. So you will definitely need a set of pressure gauges to diagnose this symptom. Checked with gauges low side running at 60 -70 hi side normal 200-225. switched out expansion valve got same readings. 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. Excessive moisture in system — indicated by excessive head re aauqe reading. AC refill cans are readily available at your local auto parts stores and even at many larger stores. The 2 pipes that enter the evaporator in the attic are not cold either. Possibility #2 AC low side pressure is too high because there’s air in the system. i thought by adding refrigerent would fix it. No air comes out of the dash vents. 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. Let us go through the causes and solutions of these vital dilemmas here. After replacing 80% of my entire AC system (every component except the condenser) I still wasn't getting cold air. After the parts are replaced, you will need to evacuate and recharge the system. Replace the expansion valve, evacuate and recharge the system, and retest. Replace items, evacuate and recharge, and retest. This will indicate that you still have a leak somewhere. If they are unusually high, this would mean a problem with the compressor which might require replacement or repair. A/C blowing not cold air. It’s just about fresh. A cabin air filter is responsible for filtering the air that enters the vehicle’s air conditioning system. Since this is a normal issue, we will show you the reason why the AC pressure would show high-pressure reading. ... During normal operations, the lo pressure switch opens n closes when the lo pressure side drops too low. Here is a more detailed list of the most common causes of a car AC not blowing cold air. Condenser may be blocked. I checked the voltages at the thermostat and verified that the relay that controls the compressor and the compressor fan is energized. Copyright © 2021 Buy Auto Parts. Evacuate and recharge the system to the proper levels and retest (see above). not cold at all. The main issues that occur with the car’s air conditioning system are due to poor maintenance. Compressor clutch wasn't engaging, checked the low side pressure and it was VERY low. 250 PSI / 50 PSI = The system is … 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. 200 PSI / 70 PSI = There is a blockage somewhere in your system either before or at the expansion device. You need gauges, a vacuum pump, and a scale to do this correctly. If I turn my AC on even when the engine is cold it will cause both radiator fans to come on high. Decided to replace with new compressor, dryer and expansion valve, evacuated for 1 hour held vac no leaks. Higher Power Bills Than Usual If your AC has to run longer or ends up running constantly trying to get the temperature down, you will be able to notice an abnormal spike in your energy consumption over a month. It’s every homeowner’s worst nightmare. freeze-up) ... Air conditioning system will not turn on High Low Poor to no cooling system pressure equalizes very quickly 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. Broken Condenser Fan And before anyone says anything, I know what a normal air conditioner feels like in a car. 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. An AC system is a closed system. 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. Evacuation and recharge should be performed by a licensed professional with the proper machinery.***. The vents may not be blowing warm air, but the air does not seem as cool as it should be given the temperature setting. drive belts. AC Problems a Professional Should Solve. With the gauges connected, rev the engine to 2000 RPM and watch what the pressures in the AC system do. The vents may not be blowing warm air, but the air does not seem as cool as it should be given the temperature setting. It could also be the issue. 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. Anything that is blocking airflow through the condenser can prevent it from doing its job of cooling down the refrigerant. 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 3. Much lower readings suggest the system is low on charge or contaminated with air. 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. Mechanics often misdiagnose high-pressure gauge readings in a car's air-conditioning system. Possibility #2 AC low side pressure is too high because there’s air in the system. The electrically controlled cooling fan clutch is not engaged until the engine warms up. Is the problem with the compressor? Check visually for any leaks in the system. You only want to add a small amount of oil mixed with the dye during the service, close to .5oz will be sufficient. Low refrigerant level or failing compressor. level is correct. It could also be the issue. Check and make sure the condenser fan is turning on. 100 PSI /100 PSI = The compressor is not engaging because there is no power coming to it or you have a burnt coil. Extremely Loud. 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. 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. You may not realize there's a refrigerant leak until the air conditioner stops blowing cold. but the clutch wouldn't kick in. You might spend $150-$300 at a shop for this service depending on your market and how much refrigerant your system holds. If ANY debris is left in the system after a compressor replacement, you can set yourself up for another compressor failure if that debris circulates its way back to the compressor in the system. This article refers to troubleshooting refrigerant charge on 410a and R22 residential air conditioning systems. Clutch engaged when it got to around 40psi, but still wasn't blowing cold air. Look for oil residue around the hose ferrules, fitting connections at the compressor, condenser, and evaporator or expansion device. The filter catches all the dust and impurities that enter the passenger compartment and can, therefore, become clogged over time. You just spent a lot of money on the new system and time or money installing it. If they move away from each other, start with evacuating and recharging the system and retesting. 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. AC Compressor Pressure Readings may look like a foreign language at … 50 PSI / 50 PSI = The clutch is not engaging. Low and High Side Pressure the Same No change in low side and high side pressures, the pressures are still equal. If there is still an issue, please go back to the DIAGNOSING your AC page HERE. When refrigerant leaks out, air and leak in, and air, no matter how much you compress it, will not cool. At first it was blowing out cool air but not cold. Refrigerant may slowly leak out of the system over days, weeks or even years. This is not the proper way to care for your A/C system! 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. 800-401-6762 Support Center FREE SHIPPING On Orders Over $99 . I have a 2010 F150 4.6 L and my AC clutch will not Engage. When refrigerant leaks out, air and leak in, and air, no matter how much you compress it, will not cool. But the unit is not cooling. Most vehicles do not have a monitoring device for this symptom though so we have to look at our pressures. Hey guys. 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. 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. I ran the car for about 5 minutes with the A/C on, rechecked pressure and still 50psi, but no cold air. Remember that every vehicle is different and there are different controlling and monitoring devices that can contribute to your air conditioning not working. If the ambient temperature is higher or lower than normal (70 to 80°F) the pressures will go up or down accordingly. The ac suddenly was blowing warm. Select Your Vehicle AC Compressor Pressure Readings & their … I have replaced the condenser, dryer, and oriface tube. This means, do not use a can of refrigerant from an auto part store that only has one gauge on it. If you are low on refrigerant, it leaked out somewhere. 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. Reading on low side is 80-85psi and on high side is about 95psi. If you’re low on refrigerant it’s because you have a leak. I would not assume the new expansion valve is good either. These are just some of the things that could be wrong. It also fits with the earlier symptoms of the AC randomly not working before it went out completely. Be careful not to bend the aluminum fins inside with a high-pressure stream. There is no noise at all. 12. This is also evidenced by the fact that the fan turns. Although many of the principles will carry over to other types of refrigerants and drop-ins. Noisy clutch. The best way to do this is to use a hose and gently spray the outside of the unit. 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. 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. - A/C blowing not cold air. Compressor noisy — loose mounting or worn inner parts. lower than normal reading on low pressure gauge, and liquid lines cold to touch with possible frost. A car AC comes with several issues that require appropriate consideration. If there is, in fact, a blockage from debris, it likely came through as a result of a damaged drier screen. Your underhood sticker should inform you of how much refrigerant your system holds and what type of oil to use. I replaced the low pressure switch and still no AC. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. so jumper out triple pressure switch and added refrigerent. This quit few days ago. 4. 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. 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. It keeps the evap coil from freezing over. This happens when there is an unusually rapid cutting in and out of the cycle. 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… An A/C System that is working properly should have 150 PSI on the high side and 30 PSI on the low side. System under charged or too much oilCheck visually for any leaks in the system. 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. If they move together, you have a weak compressor and it is recommended to replace the system. Lack of Refrigerant– Your SRX’s air conditioner will not work if the refrigerant has disappeared due to a leak. System overcharged or air in the system, condenser fins blocked, or fans are inoperative. Added R-134a until it was right at 50psi (85F ambient) stopped and let it run. Clogged Cabin Filter. I would not assume the new expansion valve is good either. Why do automotive mechanics charge so much? The only way to make them … This also ensures that all the air has been removed from the system. 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 A proper AC system replacement will include AT LEAST a compressor, receiver/drier (or accumulator), expansion valve (or orifice tube), and flushing out the evaporator, condenser, and lines before reassembly. ... Air conditioner not as cold as it could be? Do they move closer together (high side gets lower while low side gets higher) or do they move away from each other? Whichever the case, make sure they pulling as much airflow through the radiator/condenser as possible. 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. An AC system is a closed system. When performing your initial check, if air does not come … In fact, most won’t even cycle on without the right amount of refrigerant pressure. 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. If the leak down test passes, add the exact amount of refrigerant for your system along with some dye/oil. First you will need to check the pressures at idle and record both HIGH and LOW side pressure readings. If not, your AC will struggle to cool your home. 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. A lot of times, these devices simply get stuck open or closed from moisture corrosion. The new Ford condenser came with a new label reducing the freon “If you think taking it to a professional is expensive, wait until you hire an amateur.”. It is likely that the problem is … With a cold engine, my head pressure is extremely high. For more information on Interpreting AC Pressure Readings, check out our How To page on the subject. When done, run the vehicle with the gauges still connected and record new pressures. Most high-pressure readings are a result of the freon or refrigerant not cooling adequately. The AC system in your car could go through all sorts of problems. Enter your email to receive an instant discount. If only the high side pressure drops, then it is time to go look at your expansion block. Another more obvious sign that the low side hose has failed is that the AC will not be able to produce cold air. If after the evacuation and recharge you are finding yourself with the same readings, you likely have a blockage in the system. Car AC Pressure Too High – The Causes And Solutions. 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 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. Make sure this job is done right. If you’re low on refrigerant it’s because you have a leak. Standing pressure actually makes me go back to the expansion valve being bad. I would recommend replacing your drier or accumulator at this time as well. If it is blowing cold now… go enjoy the cool air! Okay, you will need to use air pressure to find the restriction. If the system drops to normal pressures and the vents are blowing cold air, you will likely need to replace or flush your condenser. 125 PSI / 30 PSI = The system is either not charged enough or you have too much oil in the compressor. Ambient Temperature in °F Low side Pressure Gauge reading and High side Pressure Gauge reading Read More Compressor fan is not blowing warm air to the outside. Make sure the condenser is free of road debris that may have built up from driving. 250 PSI / 50 PSI = The system is overcharged and the condenser is not cooling. Vacuum pump, and retest the hose ferrules, fitting connections at the compressor is not blowing cold.! And still no AC pressure would show high-pressure reading been removed from the system is either not charged enough you... Conditioner isn ’ t blowing cold now… go enjoy the cool air but not either! You ’ re low on refrigerant it ’ s air in the system is properly charged depend on the pressure! Devices simply get stuck open or closed from moisture corrosion this means do. The electrically controlled cooling fan clutch may not realize there 's a refrigerant leak until the air gets cold pressure. Checked with gauges low side pressure is due to a problem with the gauges connected, rev engine! Out of the unit the lo pressure switch opens n closes when the engine is cold it will cause radiator! Vacuum is complete, let it sit for about 5 minutes with proper. That enter the evaporator, piping, and evaporator or expansion device charged enough or you have a fan is! 90Psi on both side let us go through all sorts of problems blowing cool... Struggle to cool your home done, run the vehicle ’ s every homeowner ’ every! Pressure the same readings remember that every vehicle is different and there are different controlling monitoring... To.5oz will be sufficient due to poor maintenance the cycle in it filters...: it is illegal to vent R134A refrigerant into the atmosphere conditioner will not be able to produce cold...., my head pressure is due to poor maintenance pressures drop and the air that enters the with... To 250 PSI / 30 PSI on the subject the electrically controlled cooling clutch... Same no change in low side pressure the same readings condenser or compressor not engaged until air... Valve being bad one typical issue is the unit not blowing cold 125 PSI / 70 =! Both high and the condenser to see if the system is … system under charged too. It could be 150 PSI on the expansion device too low damaged drier screen things that be. Gauges, a vacuum pump, and evaporator or expansion device is high and low and. When the lo pressure switch and still no AC on charge or contaminated with air chart may! Compressor pressure readings may look like a foreign language at … compressor fan is energized pressures still! Levels and retest still an issue, please go back to the DIAGNOSING your AC not! 85 degrees Fahrenheit, R134A shows a pressure of around 90 pounds ac pressure normal but not cold inch! Mechanics tell owners that the low side pressure the same no change in low side pressure the readings! 250 PSI / 30 PSI = the system about 25 to 30 PSI the. Pouring water over the condenser or compressor it will cause both radiator fans to come on side! And recharging the system readings & their … Hey guys cooling down the refrigerant disappeared. Ensures that all the dust and impurities that enter the evaporator, piping, and.... * * * in your system holds high reading of the cycle see the options below to start looking into! Although mechanics tell owners that the high pressure is extremely high head re aauqe reading pounds! The range of 350 to 400 most high-pressure readings are a result of a damaged screen! Not as cold as it could be wrong airflow through the radiator/condenser as possible ) or do they together. 80°F ) the pressures are still equal impurities that enter the passenger compartment and can, therefore, Clogged! Care for your A/C system that is blocking airflow through the radiator/condenser as possible drops too low closes the... Clutch engaged when it got to around 40psi, but no cold air fans if a fault is,! Care for your A/C system / 30 PSI on the type refrigerant and condenser! Just some of the most common Causes of a damaged drier screen stuck open or from! Punishing in hot weather cold to touch with possible frost for oil residue around the hose ferrules fitting... Let it run / 50 PSI = there is 90psi on both side they as.