Question about 2001 Pontiac Montana

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Is there a way to test the compressor for high pressure

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If you are doubting the compressor is bad,remove the lines,after the ac system is discharged,and blow threw the condenser to see if it is stopped up,and go ahead and remove the orifice tube and replace it,you will have to do these things anyway if you replace the ac compressor.Rate please if this was helpful,thank you.

Posted on Jul 21, 2010

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  • Pontiac Master
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If the compressor is in the car with a high pressure of 75 psi, for instance, then when the a/c clutch cycles, the high pressure cutoff switch or low pressure switch will cut off the clutch until the pressure goes down again, on the high side and the pressure goes up on the low side.

Posted on Jul 22, 2010

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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

I've got a 97 ford Taurus can't get the A.c. to work i done changed the A.c. lines the office tube and the compressor and done changed the A.c. relay what else could it be


This is just a guess here, but, does it have gas? If there is no gas, the compressor won't start. Also check the connections in the compressor housing, and the switch inside the car, the one that turns it on.

Jul 10, 2016 | 1997 Ford Taurus

1 Answer

Aircon air problems


put a tester at the wire to the ac clutch(bit behind the pulley) and turn on the ac and the blower motor. If it lights up then the problem is in the AC system. There are to pressure switches in the system that protect the compressor. On stops the compressor if the pressure on the outlet side gets too high and the other stops the compressor if there is not enough gas. Have an ac mechanic run a pressure test to see what the problem is . If the TX valve is blocked then the pressure will be high.

Nov 08, 2013 | 2001 Chrysler Town & Country

3 Answers

Compressor not coming on check red wire on compressor with test light compressor comes on pressure good high and low air cold


If the compressor came on when you were testing it with a test light, it sounds like something is wrong with your ground for your compressor, and completely the circuit through your test light.

Jul 01, 2011 | 2003 Honda Civic

1 Answer

Ac compressor does not come on. I checked all recommended fuses. Pressure on low side is in red (High) Thank you


Assuming something works can sometimes steer us in the wrong direction, but if the fans are working, this is either a high pressure issue or a bad coil on the compressor. Do you have a test light or volt meter? If so, we can test the compressor coil and narrow it down.

Mar 23, 2011 | 2003 Honda Element

1 Answer

1992 c 1500 the ac compessor has no elect. getting to it.is it the low pressure switch?


It could be several things,I would check the fuse with a test light, the low pressure switch, the connecting

molex plug that connects to your low pressure switch could be bad and have a break on it.if all this is

okay, there is a high pressure switch at the ac compressor check to see if it has voltage. whenever you

change out the ac compressor it is recommended that you change out the high pressure switch. hope

this helps. good luck!

Feb 19, 2011 | 1992 Chevrolet C1500

1 Answer

Airconditioner compressor (clutch) on 2001 chrysler neon 2.0 does not activate when turning on a/c. a) bypass of a/c relay in engine comparment control box causes clutch to engage b) fuse is not blown. c)...


Resolution:
The problem turned out to be a blown fuse labelled EBL Clutch, located in the instrument console (side panel in the dashboard next to steering wheel on a RHD model).

I downloaded the manuals of the Neon and it advised a sequence of checks to be done:
1. Test High Pressure switch located on compressor - check that the switch w/o/ cable gives a closed reading, then test with bypass in cable.
2. Test Low pressure switch located on accumulator, ( I could not find this switch). Bypass of this switch should engage the compressor clutch
3. I discovered the blown fuse when trying to activate the rear window heater and saw that the light on the switch did not activate - went looking for the fuse for this device and then found the EBL Clutch, really by accident. Shows you how confusing an abbreviated label on a fuse can be and that it does not always support the significance of it.

Other observations:
1. A/C compressor cannot run non-stop and must be controlled by the A/C controller. Hard wiring the clutch and running the engine for a few minutes led to the compressor shuddering and then discharging some gas through the saftefy valve. Normally this power supply would have been interrupted by the high pressure valve.
2. Release of coolant gas from the high pressure safety valve located on the compressor may indicate a faulty high pressure switch, but the primary or underlying reason may be due to a blocked Dryer in the A/C system.
3. The Daimler Mercedes Neon Agents, and an A/C company and an auto electrical company all attended unsuccessfully to this problem. No discredit meant in any way, it just shows that the incorrect label here makes solving such an ordinary problem very problematic. If any advice can be given to the Agents, read the manual.

Dec 23, 2009 | 2001 Chrysler PT Cruiser

1 Answer

AC compressor clutch is cutting on and off steadily during compressor operation.Is this clutch or clutch coil?I was pushing buttons on electronic climate control,and suddenly AC stopped working,only have...


You have to start by testing the pressure in the system. If it was cycling a lot and then quit it sounds like you developed a leak somewhere and once it fell below the low pressure switch it will not come on.

The system works with a high and low pressure switch that will cut out if the pressure is too high or low. When the system looses pressure it will fall below the low while running, turning off the compressor, When the compressor is off the high side and low side equalize out bringing the stationary pressure above the low limit, turning the system on again. This cycle will repeat until there is not enough pressure when equalized to turn the system back on.

If the pressure is good, go next to the relay, it should be located on the fire wall. if the relay is right, then you need to determine if it is high or low pressure switch shutting it off. IF it is the high, you probably have a restriction in the system, You could also have a problem with the compressor. With the car not running manually turn the clutch and see how much play, smell the area and smell if there is a burnt odor, then try to turn the armature that goes into the compressor. see if it is frozen.

Aug 16, 2009 | 1992 Cadillac DeVille

2 Answers

No power to compressor or clutch


Charge it until the compressor kicks on,100psi means nothing while the compressor is off.

Jun 16, 2009 | 1995 Chevrolet K1500

1 Answer

99 olds aurora ac issues


Both switches are simple on/off, so you can test with an ohmmeter or just bypass with a paper clip. See your diagram at the link below.
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=17528

Aug 01, 2017 | 1999 Oldsmobile Aurora

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