Question about 1997 Oldsmobile Aurora

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A/c compressor won't engage so how do I jumper it so I can charge the a/c

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Once you add enough freon the compressor will kick on and begin to cycle. Make sure there isn't too much freon in the system.

Posted on Jul 14, 2010


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1 Answer

Ac not working, air compressor clutch not engaging

Hi Adeyeri

Keep in mind that the Clutch won't engage for a few safety reasons.

Temperature inside vehicle
Temperature of compressor or pipes
Pressure inside pipes
Compressor jambed
Eg It's out of refrigerant Gas

You can momentarily engage the clutch by simply giving it +12v to the wire attached to clutch. Usually has a connector close by.
If it has a Relay (click) in fuse box
You can by pass it with a jumper

A quick engage & disengage should allow you to detect possible problem.
But don't over ride the built in safety for more than about a minute.

Hope this Helps

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FIXED Car Compressor Clutch Won Engage

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Feb 23, 2016 | 2002 Infiniti QX4

1 Answer

How do I recharge the AC on a 2002 Chevrolt Malibu?

The only way to know if a vehicle's air condition is properly charged is to use refrigerant gauges to determine the high side and low side pressure while the system is running. Without gauges, there are a few things you can check:
  1. With ambient temperature over 85 degrees Fahrenheit, when you first start the engine for the day, the compressor should engage and stay engaged. If it cycles off and on for more than one minute, or if the compressor fails to engage at all, there is a likelihood that the refrigerant charge is low. (If ambient temperature is under 85 degrees Fahrenheit, a small amount of cycling is normal, but the compressor should remain engaged for a longer time than it is disengaged);
  2. If the compressor is not engaging at all, momentarily place a wire jumper across the two pins of the refrigerant pressure switch connector with the engine running and the system on. The compressor should engage. If it does not, the system is not working properly. If it does, there is likely insufficient refrigerant in the system.

Jun 18, 2014 | 2002 Chevrolet Malibu

1 Answer

No current to ac compressor

A mechanic would start at the compressor and work back.
Did you jumper the low pressure switch, or the relay, or put power directly to the ac clutch ?
You have a low pressure switch that should be closed and a high pressure switch that should be closed to put power to the compressor clutch. If the freon pressure drops below 20psi the low switch opens, if it goes above 300 psi the high switch opens.

Jul 25, 2012 | 1997 Ford Explorer AWD

1 Answer

Ac compressor good but wont start

You must have a leak, the compressor will not run if the system is low on charge, the charge carries the oil to lube the parts of the system. Also do an electrical jumper of the compressor cycling/pressure sensing switch.

May 28, 2012 | 2003 Jeep Liberty

1 Answer

Air conditioner compressor won't come on to accept freon charge

unplug the clutch cycling switch its on the accumulator jumper the the wire plug ccs also works as low pressure switch and will cut off a/c comp when system is low on freon you may also need to disconnect negative cable from battery for appx 10 minutes leave jumper until system charged then remove it plug connector into ccs (clutch cycling switch ) on accumulator if properly charged system should cycle on and off

Jul 14, 2011 | 1996 Cadillac DeVille

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.


Jun 19, 2011 | Ford Mustang Cars & Trucks

2 Answers

My 07 Honda crv A/C compressor will not engage. On board DTC, fuses and relays check OK. What could the problem be, most likely?

If you have already checked pressure or put in a can of freon, then it could be the compressor clutch is bad or is not being energized.
Check for voltage at the wire to the compressor clutch, and that the compressor is properly grounded.
If you want to by pass the relay and control for the relay, just power the clutch wire with a jumper. You should see the center of the compressor hub start to spin along with the rim of the pulley.

Aug 31, 2010 | 2007 Honda CR-V

2 Answers

Replaced ac compressor and dryer and evacuated the system, and i can't refill the the system the clutch won't engage?

you can jumper the low presser switch to in gage the clutch until you have enough freon in the a/c unit to keep the Freon low presser switch in gaged.hope this helps.

Apr 29, 2010 | 2001 Chrysler Town & Country

1 Answer

Am trying to charge my ac but my ac switch keep blinking and the comprresor dont kick in

You can make your compressor come on manually by putting a jumper
in the wiring connector going to the evaporator. It's the 2 wire plug.
If you foolw the wiring from the compressor,you should be able to
figure out where the wiring is. Just remove the plug and put a jumper wire across the terminals to get the compressor clutch to engage and
make the compressor pump.Good luck.

Mar 28, 2010 | 2002 Toyota Camry

1 Answer

91 chevy 1500 ac light flashing

try disconnecting the negative battery cable for ten minutes to reset the computer.

good luck

Jun 24, 2009 | 1991 Chevrolet K1500

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