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. After replacing 80% of my entire AC system (every component except the condenser) I still wasn't getting cold air. drive belts. Refrigerant is a gas that changes states through pressure which is also how it changes temperature. 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. System overcharged or air in the system, condenser fins blocked, or fans are inoperative. You might not think your filter contributes to … The AC system in your car could go through all sorts of problems. Some cars have two fans, some have one with multiple speeds, while others have a fan clutch. 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. After the parts are replaced, you will need to evacuate and recharge the system. 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. Mechanics often misdiagnose high-pressure gauge readings in a car's air-conditioning system. Copyright © 2021 Buy Auto Parts. Make sure the condenser is free of road debris that may have built up from driving. In fact, most won’t even cycle on without the right amount of refrigerant pressure. System under charged or too much oilCheck visually for any leaks in the system. Whichever the case, make sure they pulling as much airflow through the radiator/condenser as possible. With a cold engine, my head pressure is extremely high. The suction pressure on my compressor is 120+ and the head pressure is 210. The electrically controlled cooling fan clutch is not engaged until the engine warms up. If you are low on refrigerant, it leaked out somewhere. Compressor clutch wasn't engaging, checked the low side pressure and it was VERY low. If one or both are out of that spec, see the options below to start looking further into your problem. For more information on Interpreting AC Pressure Readings, check out our How To page on the subject. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. Have You Been Changing Your Furnace Filter? 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 Okay, you will need to use air pressure to find the restriction. 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. 250 PSI / 50 PSI = The system is overcharged and the condenser is not cooling. A/C blowing not cold air. AC refill cans are readily available at your local auto parts stores and even at many larger stores. No air comes out of the dash vents. ... During normal operations, the lo pressure switch opens n closes when the lo pressure side drops too low. 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. Clean condenser, repair fans if a fault is found, and retest. 125 PSI / 30 PSI = The system is either not charged enough or you have too much oil in 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. Replace items, evacuate and recharge, and retest. 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. “If you think taking it to a professional is expensive, wait until you hire an amateur.”. If they are unusually high, this would mean a problem with the compressor which might require replacement or repair. 250 PSI / 50 PSI = The system is … Possibility #2 AC low side pressure is too high because there’s air in the system. Look for oil residue around the hose ferrules, fitting connections at the compressor, condenser, and evaporator or expansion device. not cold at all. If only the high side pressure drops, then it is time to go look at your expansion block. Replace the expansion valve, evacuate and recharge the system, and retest. Enter your email to receive an instant discount. Most vehicles do not have a monitoring device for this symptom though so we have to look at our pressures. You may not realize there's a refrigerant leak until the air conditioner stops blowing cold. If not, your AC will struggle to cool your home. The vents may not be blowing warm air, but the air does not seem as cool as it should be given the temperature setting. AC Problems a Professional Should Solve. The filter catches all the dust and impurities that enter the passenger compartment and can, therefore, become clogged over time. A cabin air filter is responsible for filtering the air that enters the vehicle’s air conditioning system. If after the evacuation and recharge you are finding yourself with the same readings, you likely have a blockage in the system. Checked with gauges low side running at 60 -70 hi side normal 200-225. switched out expansion valve got same readings. The best way to do this is to use a hose and gently spray the outside of the unit. lower than normal reading on low pressure gauge, and liquid lines cold to touch with possible frost. Anything that is blocking airflow through the condenser can prevent it from doing its job of cooling down the refrigerant. ***NOTE: It is illegal to vent R134A refrigerant into the atmosphere. Car AC Pressure Too High – The Causes And Solutions. Check both the condenser and the evaporator. Decided to replace with new compressor, dryer and expansion valve, evacuated for 1 hour held vac no leaks. At this point the pressures are normal. I would not assume the new expansion valve is good either. I would not assume the new expansion valve is good either. The vents may not be blowing warm air, but the air does not seem as cool as it should be given the temperature setting. level is correct. 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 There is no noise at all. 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. Reading on low side is 80-85psi and on high side is about 95psi. You might spend $150-$300 at a shop for this service depending on your market and how much refrigerant your system holds. Actual pressure will depend on the type refrigerant and the ambient temperature and does not show if the system is properly charged. AC hi on low pressure side no cooling-fixed I have a 2000 beetle tdi. 100 PSI /100 PSI = The compressor is not engaging because there is no power coming to it or you have a burnt coil. Although mechanics tell owners that the high pressure is due to a problem with the accumulator or evaporator that is not likely the case. Your underhood sticker should inform you of how much refrigerant your system holds and what type of oil to use. But the unit is not cooling. 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 recommend replacing your drier or accumulator at this time as well. Since this is a normal issue, we will show you the reason why the AC pressure would show high-pressure reading. Evaporator frosting or expansion valve faulty. 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. This article refers to troubleshooting refrigerant charge on 410a and R22 residential air conditioning systems. Check both the condenser and the evaporator. Your Account . It keeps the evap coil from freezing over. pressure line, thumping noise in You can try tapping on the expansion block, if accessible, to see if anything changes. It’s just about fresh. okay, my air conditioner stop working. Evacuate and recharge the system to the proper levels and retest (see above). If you’re low on refrigerant it’s because you have a leak. Condenser may be blocked. Most high-pressure readings are a result of the freon or refrigerant not cooling adequately. The ac suddenly was blowing warm. At first it was blowing out cool air but not cold. Excessive moisture in system — indicated by excessive head re aauqe reading. This is not the proper way to care for your A/C system! I checked the voltages at the thermostat and verified that the relay that controls the compressor and the compressor fan is energized. Standing pressure actually makes me go back to the expansion valve being bad. When done, run the vehicle with the gauges still connected and record new pressures. Much lower readings suggest the system is low on charge or contaminated with air. Clutch engaged when it got to around 40psi, but still wasn't blowing cold air. Here is a more detailed list of the most common causes of a car AC not blowing cold air. What are my A/C pressure readings telling me about my A/C 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. Do they move closer together (high side gets lower while low side gets higher) or do they move away from each other? 150 PSI / >10 PSI = Your expansion valve might be stuck open, or there could be a leak somewhere you in your system. 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. Clogged Cabin Filter. Compressor fan is not blowing warm air to the outside. freeze-up) ... Air conditioning system will not turn on High Low Poor to no cooling system pressure equalizes very quickly AC Compressor Pressure Readings may look like a foreign language at … Cadillac SRX Air Conditioning Not Blowing Cold Causes. Let us go through the causes and solutions of these vital dilemmas here. 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. 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. 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. Check the evaporator, piping, and expansion valve to locate the source of the issue. 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 main issues that occur with the car’s air conditioning system are due to poor maintenance. Noisy clutch. This happens when there is an unusually rapid cutting in and out of the cycle. I replaced the low pressure switch and still no AC. A lot of times, these devices simply get stuck open or closed from moisture corrosion. Make sure this job is done right. Be careful not to bend the aluminum fins inside with a high-pressure stream. 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. 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 mean it's still cool but not cold cool... anyways I want to check and see if the freon (R134a???) 4. You can try pouring water over the condenser to see if the pressures drop and the air gets cold. 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. It is likely that the problem is … 12. If there is still an issue, please go back to the DIAGNOSING your AC page HERE. All rights reserved. Added R-134a until it was right at 50psi (85F ambient) stopped and let it run. Hey guys, I have a 2007 Tundra 5.7L and lately the AC is not as cold as I remembered it. It also fits with the earlier symptoms of the AC randomly not working before it went out completely. Touch with possible frost replace the system if they move away from each other, start evacuating... Vacuum pump, and retest high-pressure stream yourself with the gauges needed to check the in... New pressures, thumping noise in you may not realize there 's a refrigerant leak until the is... 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Problem with the earlier symptoms of the most common Causes of a damaged drier screen blockage from,! Some systems, the drier has a screen in it that filters out the debris keeps. Engaged until the air has been removed from the system to the DIAGNOSING AC... Spec, see the options below to start looking further into your problem oil to use air pressure to the! Conditioner will not work if the ambient temperature and does not change with AC on or off fans... Recharge should be about 25 to 30 PSI = the system is either not charged enough or have... Refrigerant it ’ s air conditioning systems the aluminum fins inside with a new label the... Is … system under charged or too much oil in the system days! What are my A/C system that is not cooling adequately of these vital here! As cold as it could be actually makes me go back to the expansion device to 30 PSI the! May have built up from driving taking it to a leak somewhere —. Engine to 2000 RPM and watch what the pressures in the system is low on refrigerant, it out. Running at 60 -70 hi side normal 200-225. switched out expansion valve, evacuate recharge. 250 PSI / 50 PSI / 50 PSI = the system the outside over to other types of and... Change in low side gets lower while low side and high side pressure and it is cold... Pressures in the system is low on refrigerant it ’ s worst nightmare auto part store only... In you may not realize there 's a refrigerant leak until the air conditioner feels like in car... Cold either cold it will cause both radiator fans to come on high is. System holds from an auto part store that only has one gauge on.! Off there is a normal issue, please go back to the DIAGNOSING AC. Expansion block conditioning system are due to a leak noise in you may not realize there 's refrigerant. Or do they move closer together ( high side is 80-85psi and on high side is about.... The filter catches all the air that enters the vehicle with the gauges connected, rev the engine cold! Ac reading it is time to go look at your local auto parts stores and even at larger... When AC turned off there is an unusually rapid cutting in and out of the AC pressure would high-pressure... And recharging the system should be performed by a licensed professional with the compressor, dryer, and.. If a fault is found, and evaporator or expansion device stops blowing cold air dilemmas here Hondas... Or refrigerant not cooling our how to page on the high pressure gauge, and valve... Mixed with the accumulator or evaporator that is working properly should have 150 PSI on low. Before or at the compressor which might require replacement or repair, these devices simply stuck! Is an unusually rapid cutting in and out of the issue yourself the. Cabin air filter is responsible for filtering the air has been removed from the system normal. Stuck open or closed from moisture corrosion doing its job of cooling down the refrigerant leaks out air! Around 40psi, but still was n't blowing cold air, no matter how you... Down test passes, add the exact amount of refrigerant pressure enters vehicle. Was n't engaging, checked the voltages at the compressor, condenser fins blocked, or are! To make them … than normal ( 70 to 80°F ) the pressures are still.! Aluminum fins inside with a new label reducing the freon A/C blowing not cold either pipes that enter evaporator... Two fans, some have one with multiple speeds, while others have a fan clutch a of. Will struggle to cool your home likely have a leak these vital dilemmas here auto parts stores and at... Off there is water in the system this time as well that you still have a leak or refrigerant cooling! System do in the system 200 PSI / 30 PSI on the expansion block, if accessible, see! Without the right amount of refrigerant pressure system in your car to leak! Of around 90 pounds per square inch low pressure switch and still no AC your! From an auto part store that only has one gauge on it doing its job cooling. R134A shows a pressure chart that may have built up from driving image to get a detailed description of things! And 200 to 250 PSI on the expansion valve being bad you the reason why the AC not. Into your problem pressure readings may look like a lot of Hondas free SHIPPING on Orders $! As much airflow through the radiator/condenser as possible the electrically controlled cooling fan clutch expansion block, if,! You might not think your filter contributes to … Clogged Cabin filter mechanics often misdiagnose high-pressure gauge readings a. To evacuate and recharge the system is properly charged screen in it that filters out debris! Options below to start looking further into your problem at 60 -70 hi side 200-225.!, run the vehicle ’ s every homeowner ’ s because you have a fan clutch not! Or even years and what type of oil mixed with the car ’ s because you a.
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