Question about 1991 Chevrolet C1500

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A/c clutch does not engage

Truck has new compressor ,pressure switch,and accumulator system charged up

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  • Roberta Smith
    Roberta Smith May 11, 2010

    did you check the fuses... i vauguely remember that GM had a fuse right on the compressor or a fuseable link.... an a/c shop will know which leads you short on the relay to manually engage the compressor.

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  • 103 Answers

Jumper the low pressure switch and seee if it turns on...i have seen bad switches right out of the box

Posted on Feb 22, 2009

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1 Answer

Ac wont engage


1. check to see the system is charged if it is not system will not actuate2. check the a/c compressor clutch fuse3. check low pressure switch ( this is on the big hose or on the accumulator the big metal tank by the fire wall.4. check for power at the compressor clutch electrical plug (if no power check fuses and dash panel switch.

Mar 26, 2012 | 2004 Land Rover Range Rover

2 Answers

When I remove the a/c relay and jumper the connection my a/c compressor clutch kicks in. When I removed this jumper the compressor will not engage. Is there a sensor or a switch located that controls this....


May have a bad low pressure/cycling switch. Its a two wire switch and normally found on the dryer/accumulator. You can unplug that wire and jumper it. If the clutch kicks on then either the system is too low on refrigerant to activate the switch or the switch is bad.
That switch can be replaced without loss of refrigerant because there is (or supposed to be) a shrader valve in the dryer.

Sep 05, 2011 | 2000 Buick LeSabre

1 Answer

Compressor isnt turning at all dont know if i need new one or if i need new clutch how can i tell


The pulley on the compressor is always running when your engine is running, but the only time
it compresses the freon is when the clutch engages, if the compressor's pulley was not turning,
it would have already snapped a fan belt or your serpentine belt. voltage runs from your fuse box
thru your air condition switch on your dashboard to a low pressure switch that is located at the
accumulator a long cylinder,close to the firewall under the hood or close to the condensor, front
of the car. the switch detects freon pressure in the accumulator, if there is freon pressure, the switch
will stay closed and allow voltage to go to the compressor clutch to engage it and compress the freon,
if there is no freon pressure the switch will open, and there will be no voltage to air compressor, its a
saftey switch to keep your compressor from getting damaged.its possible that the switch could be bad
it may not have voltage at the switch, or it may be open because there is insufficient freon pressure.
check and make sure there is freon in the system.check for voltage at the low pressure switch if you have freon in your system and voltage at the pressure switch, set your ac on high, pull the molex off
the switch, and jump it out with a jumper wire, if the clutch engages and your car starts to cool, just
replace the switch. if the clutch engages but does not cool, then your ac system has some blockage
in the lines. if the clutch does not engage at all then it would be the compressor clutch. good luck!

Aug 03, 2011 | Buick Century Cars & Trucks

1 Answer

I have installed a new accumulator, evaporator, condenser , expansion tube and compressor in my 1999 chevy monte carlo. i put 9 0zs. refrigerant oil between the compresser and the accumulator. i also...


Is the pressure detection switch engaged? It detects pressure in the cooling system. This switch shuts down the clutch to prevent the compressor to run when there's a leak.

Sometimes there's a looking glass on the expansion bottle showing tiny bubles. A large blob of air indicates too much air in the system. Pressure might not be enough to engage the switch when there's too much air left.

Jun 30, 2011 | 1999 Chevrolet Monte Carlo

1 Answer

Compressor will not engage on 2001 Impala? Where is low pressure switch located on 2001 Impala


It is located by the accumulator or dryer , a long canister shaped part, that will

have a pressure switch attached to it, and a two wire molex, if there is freon pressure

in the cannistor, the switch will close and send voltage to engage the clutch on

the compressor, if there is no voltage there the clutch will not work and you may

have a blown fuse or bad switch on your dashboard. i would check for voltage

at the pressure switch 1st, if its there, pull the molex off , jump it out and see if

the clutch engages. if you have power and you jump out the molex and the

clutch does not engage, you could have a bad clutch or bad compressor.

if it does engage, just replace the pressure switch, if you do replace it, make

sure to lube the seal with pag oil. good luck!

Jun 28, 2011 | 2001 Chevrolet Impala

1 Answer

I have a 2002 mustang gt. my problem is with the A/C clutch not engaging. I have checked fuss and high and low pressure switch. i have also changed compressor and clutch. both are bran new. when i test the...


When you changed the compressor, did you recharge the AC system? If the pressure switches are not actuated by the correct pressure, the system will not engage the clutch. To charge the system you have to pump a vacuum on the system for about an hour. Follow the new compressor instructions as to the amount of oil that may be in it and how much the system calls for. See it has the correct type oil and the correct amount, then charge with the correct refridgerant and the correct amount.

Gaker

Jun 19, 2011 | Ford Mustang Cars & Trucks

1 Answer

A/c compressor won't engage and the cooling fan not operating


The cooling fan does not come on until the engine temp reaches 229 degrees. it is controlled by a cooling fan relay. Cheeck for power at the fan motor and check the relay. The A/C. If yuor a/c system is low on freon the low pressure switch on the accumulator will not complete the circuit for the clutch. Check the charge, voltage present at the clutch or the low pressure switch. You can install a jumper in place of the switch to test.

Mar 29, 2010 | 1989 Oldsmobile Cutlass Supreme

1 Answer

Have a 2003 stratus with intermittent A/C works great when on, where is the pressure sensor located?, that may be problem


On this Chrysler product they have an A/C Transducer located on the high pressure hose. The switch has three wires. They also have a thermo sensor located at the evaporator case behind the glove compartment. These two things are the only ones thatA jump in the system is only removing protection the system has. So it will damage your compressor or hoses. Find the compressor follow the high hose to the high pressure switch (transducer) it has three wires. Check under the dash by the glove box and you will see a round platick lid on the case with two wires that is your thermostat (thermo sensor).
control the compressor.

The A/C clutch is controlled by the A/C cycling switch (19E561) and the A/C pressure cut-off switch, which are connected in series. The A/C cycling switch is mounted on the suction accumulator/drier (19C836), and the A/C pressure cut-off switch is mounted in the discharge line at the A/C condenser.

The A/C cycling switch closes when the pressure on the low side of the system reaches approximately 276-324 kPa (40-47 psi). The A/C cycling switch opens when the pressure drops to approximately 163-175 kPa (23.5-25.5 psi), disengaging the A/C clutch. In ambient temperatures below -1° C (30° F), the A/C cycling switch will not allow compressor operation because of low system pressures.

The A/C pressure cut-off switch is used to interrupt A/C clutch operation in the event of high system discharge pressures. The A/C pressure cut-off switch is a single-function switch that controls A/C clutch engagement. When compressor head pressures rise to approximately 2896 kPa (420 psi), the contacts open, disengaging the A/C clutch. When the pressures drop to approximately 1724 kPa (250 psi), the contacts close to allow A/C clutch operation.

This problem can be caused by low refrigerant charge. Check with a manifold gauge set and temperature pressure chart.
The cycling switch is replaceable and there is a Schrader valve on the accumulator port so you do not lose your system charge when replacing. It screws on/off. It is available at any auto parts store. It protects the compressor from low pressure which can be caused by a loss of refrigerant and subsequent lack of lubrication and prevents evaporator freeze up. Replace the switch. It is about $10. The high presure switch is about $25.

Aug 26, 2009 | 2003 Dodge Stratus

1 Answer

Ac compressor will not engage when ac is on. System seems to be full of gas. Quit without warning. This is on a 2003 Nissan Altima with 2.5L. Secondary fan does come on when AC is switched on.


Check A/C compressor relay. When you say it seems to be full of gas(freon) have you actually put a pressure gauge on the system? If the pressure is too low, the compressor will not engage. If the compressor relay is functioning, check for power at the compressor clutch. If it has power to it and it still is not engaging, the A/C clutch may need replacing. It is usually almost as economical to replace the complete compressor with clutch installed than to just purchase a clutch. Keep in mind if you replace the compressor you should also replace the receiver/dryer also referred to as the accumulator.

Jul 14, 2009 | 2003 Nissan Altima

1 Answer

I have a 1992 chevrolet c1500 4x4 5.7 litre -when you first start it up,with ac on,ac compressor clutch will engage,disengage 3 times then will not engage,if i run 12 volts to the clutch pressure switch...


The pressure switch will open when freon pressure is too low, the compressor clutch is controlled by the computer or module.
The switch isn't necessarily bad, you can check it with a multimeter. The fitting it is threaded onto should have a valve inside and an O ring to seal so no freon loss should happen when removed.

Aug 21, 2008 | 1992 Chevrolet C1500

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