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What are the low side & high side normal pressures, it cooling but not like it use to

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If it is Refrigerant 22, Low side will be about 65lbs and the high side will be 250, on a 85 degree F day.

Posted on May 20, 2011

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Posted on Jan 02, 2017

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Code on 2010 Enclave about the cooling fans running all the time while engine is on.Code is refrigerant pressure sensor cicuit low voltage. # is P0532-00.Does anybody know where sensor is located


DTC P0532: Air Conditioning A/C Refrigerant Pressure Sensor Circuit Low Voltage
The sensor gets 5 volt ref. voltage from the ECM - engine control module . Three wire sensor , all wires are to an from the ECM .

Circuit/System Description
The engine control module (ECM) monitors the high side refrigerant pressure through the A/C refrigerant pressure sensor. The ECM supplies a 5-volt reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the A/C refrigerant pressure sensor signal to the ECM to vary. When the pressure is low, the signal voltage is low. When the pressure is high, the ECM commands the cooling fans on. When pressure is too high or too low, the ECM will not allow the A/C compressor clutch to engage.

Circuit/System Testing
Ignition OFF, disconnect the harness connector at the A/C refrigerant pressure sensor.
Ignition OFF, test for less than 10 ohms between the low reference circuit terminal 1 and ground.
? If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 2 and ground.
? If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
? If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
Verify the scan tool A/C High Side Pressure Sensor parameter is less than 0.1 volts (1 psi).
? If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.
Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 2. Verify the scan tool A/C Refrigerant High Side Pressure Sensor parameter is greater than 4.90 volts (425 psi).
? If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, test or replace the A/C refrigerant pressure sensor.

A/C Refrigerant Pressure Sensor
In the engine compartment, on the high pressure refrigerant line

Do you know difference between high an low side lines ?
between alternator an the compressor

Feb 07, 2018 | Cars & Trucks

2 Answers

Cruze ac problem both side pressure riding good lp hose too much cool hp normal hit compressor engage good condensor fan good but cooling low not good cooling drive time


Your question was somewhat confusing. It sounds like you may have a set of gauges that you hooked up to your high or low side? Without a proper set of gauges to read the pressures it would be hard to properly assess the problem. A/C is all about pressure/tempeture Depending on the age of your car, you have r-12 or post 90' or so 134-a. Whatever the temperature is that day your pressures should be within a range . If it's too hi or low would indicate a problem. In the mean time it never hurts to clean your coils in a car you're probably only going to be able to clean the condenser. So I guess I would have to need to know what refrigerant you have and what were the pressure readings. You did say that when you turned on your AC the compressor was working?

Jun 06, 2016 | AC Cars & Trucks

2 Answers

2005 vw jetta why won't my high side high pressure go down


I assume you are talking about your a.c unit, if so the high side pressure takes a while to go down after turning a c off, it its too high it is either overcharged or there is a restriction

Oct 14, 2015 | Cars & Trucks

2 Answers

I have a 2006 mitsubishi lancer. The a/c works intermittently. Works the least the hotter the day gets. The presures are 25 low side & 145 high side @ idle. What are the proper pressures ? I beleive...


Those pressures are OK and within specs. I would suspect the cooling issue lies with the air temperature control blend door actuator and or the blend door sticking in the ducting due to warpage.

Jul 26, 2017 | 2003 Mitsubishi Lancer

1 Answer

My AC doesn't seem to be as cool as usual ive checked the pressure ( 100 and 30 )but i cant find what normal is. the model # on my unit is 561cj048-f


Hello, if the high side pressure iS 100 and low side 30, then the unit is undercharged. Im assuming this is a R-22 unit. Typically your low side should be between 65-70 psig and high side should be between 220-230 under normal conditions.

Jul 08, 2011 | Bryant Heating & Cooling

1 Answer

Air conditioner compressor runs - freon is up to proper level....not cooling??


BOTH High and low readings should be checked to have a better idea of what is going on with an AC system but based on the limited information… the compressor is not engaged or is not pumping. Below are some things I would check;

1. Check the high and low gauge readings with the AC on & set on MAX/Recirculate, middle vents with the engine at 2,000 RPM’s, blower speed on high.

2. Check the vent temperatures with a thermometer from the middle vents, far right & far left vents?

3. What is the outside temperature at the time the readings were taken?
4. Check to see if the condenser fan blowing strong?

5. Notice if compressor clutch is cylcling excessively.
Could be overcharged, not enough air going across condenser fins, compressor not pumping sufficiently… BOTH gauge readings are really needed to get a better idea.
Below are normal car AC pressure readings with 134A.

Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI

Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI

Normal high side reading ranges from 200-350 PSI

Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor

Thank you for using fixya and good luck, keep me posted. Be glad to help you get your A/C running again soon.

Jun 12, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

AC comes on, then shuts down before car is cooled. Compressor activates and blows cool air for about 15 seconds then shuts down.


Low on R134a, you need to have the system recharged. Try to stay away from the do it your self kit that most Auto Parts store carry.
Below are normal car AC pressure readings with 134A

Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI

Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI

Normal high side reading ranges from 200-350 PSI

Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.

Thank you for using fixya and good luck.

http://www.freeautomechanic.com/airconditioning.html

Jun 12, 2010 | 1998 Cadillac Eldorado

2 Answers

AC not cooling


You need to have the system vacuum evacuated, using a vacuum pump and a set of gauges, to verify that it is holding. You also must install EXACTLY the amount or refrigerant that the system calls for. Too much or too little will result in failure.

Sep 03, 2009 | 1995 Geo Prizm

1 Answer

Durango AC Wont Cool


Yes,it probably is & cheapest way to start. 200 isn't the end of the world,150 is normal. Depending on ambient temp that could be fine. The dryer could be restricted as well. Last possibility is the r134 is low or overcharged.

Jun 27, 2009 | 2004 Dodge Durango

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