Ac Comp Stays On H E L P

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May 28, 2006 | 05:53 PM

1blkc4

Thread Starter

Racer

Joined: Feb 2006

Posts: 489

Likes: 7

From: EUSTIS FL

Ac Comp Stays On H E L P

Have A 94 C4 The Ac Comp Is Staying On When I Turn Off The Electronic Controls . Any Suggestions???

May 28, 2006 | 11:13 PM

red_johnny

Burning Brakes

Joined: Jan 2005

Posts: 1,217

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From: Augusta GA

Try searching the forum and you will most likey find the answear. I have seen a ton of AC problem posts. The only thing I can think of is that either the switch to the AC is bad or the AC is bad. What I have done before on another car I had that was doing this was I disconnected the AC compressor plug from the compressor. That way it was running in nuetral and not in danger of ruining the belt. Dont want the AC clutch to lock up. Good luck on finding the problem

May 29, 2006 | 12:01 PM

SunCr

Le Mans Master

Joined: Dec 2000

Posts: 7,839

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From: San Diego, Ca

Start by checking the relay which is driven or grounded by the PCM when a/c is requested - I'd simply replace it or check for a short to ground on the PCM side.

May 29, 2006 | 10:08 PM

1blkc4

Thread Starter

Racer

Joined: Feb 2006

Posts: 489

Likes: 7

From: EUSTIS FL

where is that relay located??

May 30, 2006 | 01:56 AM

93*Corvette

Pro

Joined: Jan 2006

Posts: 667

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From: Centennial Colorado

Quote:

Originally Posted by 1blkc4

where is that relay located??

May 30, 2006 | 07:04 AM

1blkc4

Thread Starter

Racer

Joined: Feb 2006

Posts: 489

Likes: 7

From: EUSTIS FL

thanks for the great info

May 30, 2006 | 08:31 AM

pcolt94

Le Mans Master

Joined: Jan 2006

Posts: 5,621

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From: Orlando FL

There is the possibility of the electronic temp control assembly is not working right or sending the correct signals out to the rest of the system, mainly the cycling switch. After you have explored the relay situation, if you find nothing you may want to consider this. Remove the control box and clean the connector on the rear of the box, and plug. If that does not work, leave the control box disconnected and start the engine. If the compressor runs you are back in the car wiring. If it stops the box may be the problem. The last item would be the cycling switch and that's a very low possibility because even if it was bad the programmer should shut off the compressor.

Relays generally fail in the open condition and not closed (energized). If a signal is causing the relay to be hang closed, then that signal (ground) needs to be checked from the PCM.