Checked with gauges low side running at 60 -70 hi side normal 200-225. switched out expansion valve got same readings. This condition usually means there is a restriction in the system or the TXV/Orifice Tube is blocked or closed. Use an Ohmmeter to find if it is giving the correct reading. A high pressure switch does the same thing if pressure builds too high on the discharge side (high side) of the system. This happens when there is an unusually rapid cutting in and out of the cycle. We are a team of ASE certified Any time the compressor is cycling but no pressure is building, it typically means the compressor is not doing anything but spinning. I'm checking because the rear AC is blowing ambient and the front is cool, 49F or so. why? When all of these components appear to work fine and the AC low side high, high side low problem persists, you may need to change the compressor to fix the unit. Most AC system will still be able to hold the proper low side pressure even though they are overcharged, so by the time a low side only gauge would show the low side pressure being to high from being overcharged, it may be so overcharged the high side pressures may be so high they will burst the system or damage the compressor. I'm trying to figure out why the high and low side pressures are equal with the car idling and the compressor running/loaded. Then retest system to … Is the cooling fan running constantly? Are Cars Designed to Fail At A Certain Point? Yo… Most high-pressure readings are a result of the freon or refrigerant not cooling adequately. They are usually located in the back of the compressor housing and held in with a snap ring. In general, it is not common to have a high reading with low side pressure reading and the normal one with high side. Quite often, as noted on the previous page, an air compressor will have a “valve plate” on which will be found both the intake and pressure valves. When compressor cycled off, low side pressure 100psi and high side pressure @400psi. Normally, if a compressor is weak or defective other issues within the system may be responsible for this occurring. There are several constraints that cause this state. Compressor still will not build pressure Possible Air Compressor Gasket Failure. If The Truck Is... About A Month Ago, My Compressor Went Out. Tsukasa Azuma is an awesome car blogger of Car From Japan. I Have A 2005. So if the pressure exceeds 150. The dirt is clogging, and so there is an obstruction in the flow of air. So far example when the truck is warming up and the fan clutch is not engaged (several minutes), if I turn the AC the High side climbs to approx 350-400 (high side pressure sensor turns off compressor after 430 I believe), and the low side can get up to approx 60 – 70. Shop Says The Relay Is Good. 200 PSI / 70 PSI = There is a blockage somewhere in your system either before or at the expansion device. I evacuated the system and pulled a vacuum on the system and it held 28 for over 12 hours. If you feel a good suction then replace the expansion valve , evacuate, and recharge. Start the car and turn the AC on. A/C or Heat Pump Compressor High Head Pressure Diagnostic Checklist 12 Causes of High Head Pressure at an Air Conditioner, Heat Pump or other Refrigeration System. Symptoms of a Bad Variable Valve Timing Solenoid and How to Replace, 5 Reasons Why Brake Lights Not Working But Tail Lights Are, 6 Most Common Crankshaft Position Sensor Symptoms, Iwamotocho 3-10-7-7F, Chiyoda, Tokyo, Japan 101-0032. I checked the compressor from the high side hose and also from the suction hose. Acceptable operating pressure ranges for Vintage Air systems (R134a): High-side pressure: 160 to 250 PSI. AC hi on low pressure side no cooling-fixed I have a 2000 beetle tdi. I have both presure and suction but when I connect the hoses to the system and put my gauges on with the correct amount of r134 my gauges stay at 150 high side and 25 suction with no change even when I … The switch is located near the expansion valve. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. Below we list a dozen causes of high head pressure in an air conditioner or heat pump compressor motor. What Are the Reasons for BMW i8’s Rapid Depreciation? Pressure Range Low side: 0 to -29.99 psi High side: 71 to 85 psi Indications Low pressure side becomes a vacuum High pressure as listed above Frost or condensation on the front and rear pipe connections of the receiver dryer or expansion valve Causes AC system is blocked by contamination or ice White Smoke From Exhaust: Main Causes and How to Fix, 10 Best Tire Companies In The World [Updated In 2021], Take Advantage Of These Ten Easiest Cars To Work On. The ac also will not run without a signal from the high pressure switch. Even though the compressor motor might shut down due to it having a thermal cut … The fact that you pulled it down and it held a vacuum shows there is no leak but the compressor itself is not building pressure. Open the low side only valve and allow the charge to build to 30 lbs. The ac suddenly was blowing warm. The AC system in your car could go through all sorts of problems. The result is the compressor motor will overheat. mechanics that have created this guide for you so you can understand how the The Best TOAD Vehicles for Frequent Campers. 20 plus year old 30,000 btu condenser with 50 lb suction and 285 head. There are saftey switches for both side to protect the compressor. 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 are low on refrigerant, it leaked out somewhere. The air compressor may be building pressure, or trying to, but it cannot due to a major leak on the compressor. 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. System design, blower speed, mode setting, refrigerant type, all cause variance in high and low side pressure. on the low side and 150 lbs. 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. 1993 c1500 - 5.7L - 2nd style a/c system (originally r12, retrofitted) A few months ago I replaced my compressor, dryer, orifice tube (the expensive auto-adjusting extreme duty one), and condenser. With sensor unplugged and a/c on highest setting, low @ 35psi and high @ 200psi. It should be at 220psi. On the other hand, there is possibly a huge leak when the pressure is zero. Ac Does Not Work. Problems with AC Pressure. However, it is always better to consult a mechanic before deciding to replace any part. There is a slim chance that you have a complete restriction but that normally always presents itself as a very high pressure on the high side. I'm not 100% positive, but I believe the high pressure switch is a cutoff switch for excessive high pressure to stop the system from damaging itself. That Is As Far As They Got. Compressor (engine) RPM and airflow across the condenser are always changing, thus engine speed is always affecting pressure. Decided to replace with new compressor, dryer and expansion valve, evacuated for 1 hour held vac no leaks. This tube works as an expansion valve to regulate the refrigerant amount flowing to the evaporator. What separates these two valve areas are gaskets. The cost of repair and replacement of compressor is high (about $450 plus $700 labor - price fluctuates greatly depending on car) as the dash might need to be removed for repair. manifold gauge shows vacuum on low side and no pressure on high side. … When I put the gauges on the high side pressure is high, & the low side is normal. Note: The most ideal pressure readings are around 150 high and 30 low. system works and what to... After Running The A/c In Hot Weather, When The Truck Is Shut Off For A Short Period Of Time The A/c Will Not Blow Cold Air. Japanese Government License No# Tokyo 305561505308, Member of JUMVEA (Approved by Government of Japan) No. Need to fix your car's air conditioner? On 2017-09-21 by hal. The front use to blow around 39F. To gauge the pressure, hook up a gauge set to the AC system and record the pressures of both low and high sides. On 2017-06-12 by (mod) - Condenser may be blocked. When compressor cycled on, low pressure @ 35psi and high pressure @ 200 psi. The possible reasons could be an excessive amount of Freon going to the evaporator. For this reason we simply can't … He owns a car repair shop at downtown Osaka, and he put all that experience to good use in his sharing posts. The same problem arises when the o-ring seal outside of the orifice tube wears out. It could be an issue with the orifice tube too. Check the ambient temperature and see if the pressures match the numbers on the pressure chart. Chevy Silverado 4.3l And Have Ac Problems I Cehecked Refridgerent Its Good Actually All They Way In Red (but I Figured Its... https://www.2carpros.com/articles/replace-air-conditioner-compressor, https://www.2carpros.com/articles/re-charge-an-air-conditioner-system. Insufficiently cooled freon automatically causes the pressure to increase. If they are lower and the compressor did not come on, then it is undercharged and needs Freon to make the low side switch come on and activate the compressor. aircon is not cold. Low-side pressure: 6 to 18 PSI in a steady state. Refrigerant does not circulate. Matching readings means that you don’t have to worry about the level of Freon. Facts and Fallacies! Before deciding to replace the compressor, other components that you may check are the pressure switch, expansion valve, and the compressor clutch. It reads around 110 psi. 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 Although mechanics tell owners that the high pressure is due to a problem with the accumulator or evaporator that is not likely the case. The high side fitting and hose gets really hot. Also compressor does not cycle on and off with sensor unplugged. The compressor does cycle off and on. One thing to check right away is the tank drain valve. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. Your email address will not be published. If you do not feel any suction then you have a compressor that is bad. It kicks the compressor on and off between 26 and 30 psi. If not the compressor may be worn out. The air compressor low side is at its normal psi. What Is Shift Lock Release And How To Use It? I have tried to add Freon and it seems to be full. Can the compressor build the pressure? I Have Auto Climate Control And Ac Will Not Turn On, Can't Get Compressor Clutch To Engage. I added oil, vacuumed the system, and then started … Center duct temperature: 36 to 46° F. Charge as follows: R134a = 1.8 lb. One symptom indicating a complication in the air conditioning is AC low side high, high side low pressure. cleand cond coil ,ambient 87 f. head was 375 until I cleaned the cond coil. A pressure switch or sensor could be bad. When its opening becomes bigger than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies. Driving a Toyota Land Cruiser: Why Is It Appealing? What could be the problem?? Look for oil residue around the hose ferrules, fitting connections at the compressor, condenser, and evaporator or expansion device. One thing is that if you star the vehicle and turn on the ac you hear the compressor engage. On the low side of the chart, the pressure is low while the temperature is high. A Safe and Secure Way to Flush AC System After Compressor Failure, The 7 Best Car Batteries For The Money in 2021. An air compressor that will not build pressure runs on long past the point where it normally would reach the cut out pressure level and stop. on the high side. Lower Low Side and Higher High Side Pressures. One typical issue is the unit not blowing cold air, which could be punishing in hot weather. Also, check if the compressor clutch engages and rotates the compressor when the AC is on. It could also be a failed thermal bulb that is unable to pick up the temperature signals or the TXV stuck to the open position. Watch your pressures.. watch to make sure the high side does not exceed 150 or that the low side does not go below 15 psi. 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. In fact, the temperature is directly related to the system’s pressure. 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. You can measure the refrigerant’s pressure at a given temperature. If you leave your compressor tank drain open between compressor uses, as many folks do, make sure that the tank drain is closed before the compressor is started. Top Four Types of Car Insurance Coverage – What Are They? NOTE: A general rule of thumb is two times the ambient (daytime) temperature, plus 15 to 20%. How To Reset Check Engine Light: Follow These 4 Easy Ways! Does the pressure go up? Issues with the Condenser If you are dealing with this issue, it would be because the compressor is cycling incorrectly. Similarly, the fan also has to spin when you turn the system on. There is a temperature chart for refrigerant pressure that you will find available online. How Long Do CVT Transmissions Last? Compressor Does Not Engage. Tsukasa’s blog is one of the best resources for information about keeping your favorite imported car running smoothly. What if the low-side pressure is low and the high-side pressure is high? The high side does not move and it is at 30psi. Intermittently cold air will blow for a few minutes. A low pressure switch disengages the compressor clutch when the pressure is too low on the suction side (low side) of the AC system in order to protect the compressor from damage. Readings higher than the chart indicate an overcharged system while lower readings confirm a low level of refrigerant and a possible leak. There also could be an obstruction of the refrigerant flow in the compressor. A complete system evaluation should be performed to prevent damaging the new compressor. High pressure inside the condenser fan can causes the aluminium to distort and evaporator coils to leak. 000569, Member of Tokyo Chamber of Commerce Boueki - 201650, The Reasons for AC Low Side High, High Side Low Pressure, 8 Common Symptoms of a Clogged Radiator You Must Know, How To Charge a Deep Cycle Battery Properly, Things To Avoid While Driving An Automatic, Best Tire Pressure Monitoring System Reviews. I check Freon and low side reads avg around 50 and high side does not read. 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. I Had It And The Accumulator Replaced. It should mean the system is not operating on its optimal capacity. It may also control the AC condensor fan. In other words, the cycles are moving out and in too quickly, which cause these high readings at the low side. 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The chart, the 7 best car Batteries for the Money in 2021 rotates the compressor Clutch to.! Replace the expansion device for information about keeping your favorite imported car smoothly! The low side only valve and allow the Charge to build to 30 lbs 70 =! Similarly, the 7 best car Batteries for the Money in 2021: most.: 6 to 18 psi in a steady state or trying to but! An overcharged system while lower readings confirm a low level of refrigerant and a possible leak given! Side only valve and allow the Charge to build to 30 lbs Azuma is an unusually rapid cutting and... I8 ’ s pressure lb suction and 285 head favorite imported car running smoothly spin you. @ 35psi and high sides the fan also has to spin when you turn the system be! At its normal psi for refrigerant pressure that you don ’ t have to worry the., but it can not due to a major leak on the high side ) of chart! 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