No power at AC compressor

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Sep 2, 2008 | 03:11 PM

Sweet6

Thread Starter

Junior Member

Joined: Dec 2006

Posts: 15

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From: Chicago Burbs

Car: 89 Turbo Trans Am

Engine: 231 Turbo 6

Transmission: 200R

Axle/Gears: 3.27

No power at AC compressor

Any ideas where to look? The fuse under the dash is good. But that is only for the blower fan I believe. Let me know of good places to look.

Thanks

Sep 2, 2008 | 04:04 PM

jv9999

Senior Member

iTrader: (1)

Joined: Jul 2007

Posts: 1,141

Likes: 2

From: MA

Car: '87 IROC/'68 SS

Engine: 5.7L/350

Transmission: 700R4/Muncie 4-spd

Axle/Gears: 3.27 9 bolt / 3.31 12 bolt

Re: No power at AC compressor

Quote:

Originally Posted by Sweet6

Any ideas where to look? The fuse under the dash is good. But that is only for the blower fan I believe. Let me know of good places to look.

Thanks

Have you tried shorting out the pressure switch? It could be low on refrigerant.

Sep 3, 2008 | 08:40 AM

Sweet6

Thread Starter

Junior Member

Joined: Dec 2006

Posts: 15

Likes: 0

From: Chicago Burbs

Car: 89 Turbo Trans Am

Engine: 231 Turbo 6

Transmission: 200R

Axle/Gears: 3.27

Re: No power at AC compressor

Yes, I just filled it with 134. There was no power at the compressor. I checked it with a volt meter. So I am guessing bad relay/wiring. I was thinking of jumping the high and low pressure switches too. But I am open to any other suggestions.

Sep 3, 2008 | 09:45 PM

joeld

Junior Member

Joined: Aug 2008

Posts: 82

Likes: 1

From: Ga.

Car: 1986 Firebird, 1989 Vette, 1995 GP

Re: No power at AC compressor

This might not apply to your model, but on my 86 there is a pressure switch on the power steering hose (high pressure line) that has to operate for power to reach the AC comp. My switch is very close to the steering box in the line. And I know from experience that this switch will prevent AC comp from running if faulty. Just something to check.

Joel