A/C Compressor Not Cycling - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-02-2006, 01:50 AM   #11
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My friends 96 had a problem with the relay located on the firewall, actually the socket that the relay plugs into was the problem. You can try to tap on the relay or jiggle it and see if the clutch kicks on then.

Jeff
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Old 06-02-2006, 09:46 AM   #12
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Ok..weather was warm enough for me to be irritated with my AC yesterday. Broke out the book.

Under diagnosing in section 1B it states if the temperature coming out is not adequate, and freon is under 50psi to add a pound as the system is low. Seems like mighty high pressure.

My system was around 30-35 and was cycling at that pressure.
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Old 06-03-2006, 01:51 AM   #13
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Quote:
Originally Posted by bill buttermore
If yours is like my '95, or older models, the low pressure switch is on the accumulator, up against the firewall. I have jumped that to check the function of the compressor clutch when the charge was too low to allow the compressor to kick in. I would not mess with the switch on the compressor, I believe that will be the high pressure switch.
You're correct, if the compressor isn't coming on jump the 2 wire switch on the receiver drier, then the compressor if any good should come right on.

I would also like to say, please get a real set of Guages, the walmart special guages are junk. You should get a reading on the low side and the high side, this will give everyone a better feel for your A/C.

Good luck,
Sellncars
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Old 06-06-2006, 11:38 AM   #14
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Boy, I am not doing to good here! I can not find a pressure switch with only 2 wires. Does anyone else have a 97 SSE? Where is the switch? Can I run 12V right into the plug on the compressor to see if it will kick in? Does it matter which terminal gets + and which gets - ?
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Old 06-06-2006, 11:41 AM   #15
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Quote:
Originally Posted by Bob Keyes
Boy, I am not doing to good here! I can not find a pressure switch with only 2 wires. Does anyone else have a 97 SSE? Where is the switch? Can I run 12V right into the plug on the compressor to see if it will kick in? Does it matter which terminal gets + and which gets - ?
I'll look at the 97 fsm'* tonight. you don't have to get 12v to the compressor though, you could just ground the compressor relay to do the same thing. it'* in the relay center on the firewall.
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Old 06-06-2006, 01:55 PM   #16
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Quote:
Originally Posted by sellncars
I would also like to say, please get a real set of Guages, the walmart special guages are junk. You should get a reading on the low side and the high side, this will give everyone a better feel for your A/C.

Good luck,
Sellncars
Why do you say the Walmart gauges are junk?
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Old 06-06-2006, 11:28 PM   #17
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firewall relay center, left most relay, pin 85 on relay (drk grn/ white) to ground will put 12v through relay to compressor. if you want to know where 12v goes on the compressor it is the drk green wire. If you put the drk green/white wire to ground and don't trigger the compressor clutch, see if 12v is at the drk green wire on compressor. If you don't have 12v, switch relays with the one next to it (horn). of horn works when you switch them, the relay is good and you are missing 12v to the relay. the pink wire on the first relay is 12v hot all the time (fuse 7E, 10 amp)
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Old 06-29-2006, 04:24 PM   #18
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Thank you for the tip Sonoma! I have been on vacation and not had time to deal with this thing. OK, last night I tried your procedure to ground out the compressor relay. I found the wires you described and followed your instructions. Still nothing. I did not see 12V at the compressor. I looked for it across the green and pink wires and from the green wire to ground....nothing. I switched relays......they are all good. Does that check by pass everything on the system? (ie cycle switches etc) I still can not find a cycling switch with 2 wires around the accumulator also. Any other ideas before I just bite it and take it somewhere?
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Old 06-29-2006, 04:31 PM   #19
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sounds like you don't have 12v at the relay, or you could have a bad ground. you didn't say if you checked the fuse. this check has nothing to do with the cycle switches, it just tests if the compressor clutch will kick in if called for.
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Old 06-29-2006, 05:16 PM   #20
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Default Re: A/C Compressor Not Cycling

Quote:
Originally Posted by Bob Keyes
Hi all, I have a couple of questions with my 97 SSE (with electronic climate control):
I hit my AC button last Saturday and got no cold air. Last night I was working on it and I found a lot of usefull information here in this forum but not enough to correct my problem yet. Comressor is free, R134a is at about 35# (according to my fill kit that is ok) but the compressor will not cycle. How do you jump the pressure switch? There are 3 wires: blk, red and tan. I swapped the relay and fuse in the maxi fuse center and still nothing. I also tried tapping on the compressor clutch. Any other things to check?
if you got 35psi on the low side with compresser off that should start it off,
if nothing else put a nother half can in and bump the pressure up see if that
helps,,

you may have a bad clutch too,,that just won't engage,,when was the last
known time it worked???
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