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AC cooling issue.. Cooling fans not coming on


vwtech93
08-16-2008, 02:35 PM
I'm working on a 02' Olds Intrigue and I have charged the AC system to 1.02kgs and still no cooling pressures are at 200 low and 40 high. Compressor kicks on still no cooling my pressures I believe are way out of range due to the cooling fans are not coming on. I have checked all fuses and relays, I have power at the relays ans fuses but no power to the fans. Looked up the wiring diagram and it looks like it is controlled by the PCM. I'm believing that it here where my power id not being transmitted or ground, the circuit is not being completed anyhow.

Anyone seen this before? Have any ideas?? Other than running my own wires.

Thanks, Thomas

harmankardon35
08-16-2008, 05:24 PM
sounds like a bad compressor, if the system is charged up and the compressor is running, but the lines under the hood don't get cold, then the compressor is likely worn out.

vwtech93
08-17-2008, 09:28 PM
That doesnt expalin why my cooling fans arent working. If my compressor was bad my fans would still work.. The compressor is turning pressures might not be correct but its still turning. So my cooling fans should come on with the AC on

LittleHoov
08-18-2008, 02:03 AM
Do you have digital climate control? If so is your external temperature reading accurate?

In fact, heres an interesting question, do vehicles without digital climate control still have an ambient temperature sensor? It would make sense if they did.

If your sensor is showing a false reading and saying its too cold, the AC wont work.

willibc
08-18-2008, 06:37 AM
I am having the same issue. Was thinking it was the PCM as well. Havent' had time to finish working on. If you find a fix. Please post it. I have been trying to figure this out for a while now.....

brcidd
08-18-2008, 07:56 AM
GM "W" bodies "wait" on discharge pressure to enable the cooling fans- they come on at 175 psi-- so is your pressure transducer on the high side line (below air cleaner) plugged in-- etc

It is designed like this so the fans don't have to run while driving on the highway..

vwtech93
08-26-2008, 08:31 PM
Yes, my high pressure switch is plugged in. Thanks though. I'm replacing the AC compressor, reciever drier, and orfice tube.

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