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.

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.

I wonder why my air did that I will have to try that

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

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.

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.

If I remember correctly air box to get evaporator core out = removing entire dash.

Someone please tell me I'm wrong.

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

It'* a good chunk of work to pull the dash out. Plan to be down a couple good days of work.

Yes that worked John Deer Boy. Thanks! I guess I can buy a new high pressure cut-out switch that will work better.