a/c only works after disconnect and reconnecting battery - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-19-2005, 10:12 PM   #1
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Default a/c only works after disconnect and reconnecting battery

We have a 92 Pontiac Bonneville SSE. Our A/C quit working and was recharged but now we figured out that after the battery has been disconnected it will work again for a short period of time, then just switched back to Econ mode and stops blowing cold air again. What causes this? I tried just pulling the A/C fuse to see if I get the same result but this doesn't work. You have to actually disconnect battery and wait a few seconds then reconnect for it to work again. Then we get Auto mode and cold air.
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Old 06-19-2005, 11:00 PM   #2
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Since you said you recently had the system recharged, I'm assuming your car has been converted to 134A. So it sounds like the high pressure cut-out switch is shutting off your air since 134A runs at a higher pressure and the compressor has to run for a bit before the high press cutout switch will throw. Try hotwiring the high press cutout switch (close the circuit) and let us know if it works. It is located on the back side of the compressor.
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Old 06-20-2005, 12:36 AM   #3
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I wonder why my air did that I will have to try that
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Old 06-20-2005, 01:04 AM   #4
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mum1218 you are my new best friend the trick works. I well have to try your trick next john deere boy. I will try that in the morning. So just to be sure I take the to input wires and wire them closed
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Old 06-20-2005, 01:09 AM   #5
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Yeah, but i don't remember which plug on the compressor is which, and its too late to go look at it tonight. Just make sure you got the right one. It will have a hex head behind the plug.
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Old 06-20-2005, 11:50 AM   #6
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I talked to mechinic that I have work on the car . He said that most likely the pressue is too low in the system that is we it cuts out. From what I have been told that is bad idea to by pass the sensor. Not that your idea isn't great idea. I was also told that evapator core is usually what leaks on the system. So I will think I will start my advunture their with the air. For this summer I will just keep adding r-134a to the system. But right now the system blows 62 degree air.
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Old 06-20-2005, 12:48 PM   #7
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If I remember correctly air box to get evaporator core out = removing entire dash.

Someone please tell me I'm wrong.
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Old 06-21-2005, 11:42 AM   #8
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Well that sound like fun. I guess when I do that I can fix some wiring problems. Bad Alarm wiring from previous owner falso fried the high beam switch on car. Then my trip odometer has also broken so I will take that apart at the same time. That might be also why the mechinic sound like he didn't want do it
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Old 06-21-2005, 03:31 PM   #9
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It'* a good chunk of work to pull the dash out. Plan to be down a couple good days of work.
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Old 06-22-2005, 08:46 AM   #10
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Yes that worked John Deer Boy. Thanks! I guess I can buy a new high pressure cut-out switch that will work better.
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