HELP!!! AC PROBLEMS - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-25-2004, 09:27 PM   #1
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Default HELP!!! AC PROBLEMS

please help. my ac will not work. we put a new compressor on and it just cycles on and off and will not stay cycled on at all. we have enough juice in there and all is hooked correctly. called autozone and they said it may be the pressure switch and that i could short across the wiring harness and i did that and still all it did was cycle on and off quickly. please help!!!
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Old 05-26-2004, 01:06 AM   #2
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Where did you jumper the wires? That'* a classic sign of low refrigerant.
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Old 05-26-2004, 01:52 AM   #3
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It took almost 3 cans.
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Old 05-26-2004, 10:30 AM   #4
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If you have a guage for the low side, what happens is as the compressor runs it will try to pull a vaccuum on the low side. If the refrigerent is low, it will pull down below about 25 psi at which point the low pressure switch turns off the compressor until it bleeds back to about 45 psi.

If low on refrigerant, it will pull down to 25 psi and cycle off much sooner than it should.

My system takes 39 oz of R-134 and I think that relates to about 42 oz of R-12. Most cans are either 10 or 12 oz so it probably needed more than three cans.
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Old 05-26-2004, 04:20 PM   #5
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A friend of mine is looking at the car. He just called to say that:
1. I have a leak in my line
2. I need the orifice line/tube replaced (that is causing most of the problem)
3. I need the drier.
He also mentioned something about an inflator valve???

He said he will try to fix it as reasonably as he can so we will see what he calls reasonable.
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Old 07-02-2004, 01:27 AM   #6
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well guess i'm a little late i was gonna suggest checking the orfice, good luck hope he gets ya fixed
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Old 07-07-2004, 01:27 AM   #7
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Default I Can Help

Your friend is on the right track. All of that should have been done with a compressor changeout. The lines should have all been disconnected, flushed and blown out with dry shop air. Also flush and blow out the evaporator and condenser. Backflush the condenser if it looks dirty. The orfice tube which is in the little line with a flare nut should also have been replaced. If you are using R134a then all O-rings should be replaced with new ones and then add 4ozs ESTER 150 oil to compressor and 2 ozs to a new accumulator(that silver can) and 2 ozs to the condenser. Evacuate the system with a vacuum pump (you have to do this and you can rent one) Then WEIGH in the charge of 32 ozs R134a. You are done. I just converted my 87 over to R134a just like this and i have no complaints. I too live in Hot, Hotter, and My tires just melted! I am a refrigeration tech, and I can tell you if you don't do it right the first time, you will pay to fix it the 2nd time and the 3rd time etc..etc..
E-mail me with pressures and temps. at 1000RPM'* for 2 minutes with Fan on High, and Max with windows and doors closed. Thermometer should be in center vent.
[email protected]
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Old 07-10-2004, 03:09 AM   #8
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my AC for years has been vent with windows rolled down . how do you take out the AC? that would just be easier
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Old 07-10-2004, 12:46 PM   #9
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There are places other than the great white north. We just have winter in July-September: you do not go outside unless you must and utility bills go up. We also try to get all work done before 90.

I grew up in Florida before a/c was common and do not care to repeat the experience. *All* of my cars (including the 1970 Ram Air/4 spd Judge) have a/c.
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