Pontiac Problems? Ask a Mechanic for Answers ASAP
Hello & Welcome,
Can you tell us if the AC compressor turns on?
Do you have a multimeter you can use to do some tests?
OK - Good.
Let's see what we can do without the scan tool, for now.
Do you have the Automatic or Manual AC control system? The Automatic usually has a temperature display you can set, while the Manual system just has a knob that you can turn from Cold to Hot.
It could be one or more problems. Let me grab some schematics and do some checking.
I have a couple of schematics for you. The first is for the compressor controls.
Here is a schematic for the Temperature controls.
I noticed that each of these have two fuses leading to the control panel, and there is at least one more in the top schematic. You did not mention if you actually checked to see if there was power coming into and going out of these fuses, so I would like you to check them with your meter. Check both sides of the HVAC CTRL and DIC/HVAC fuses. There are located in the instrument panel fuse block, on the passenger side. Here is a diagram of this panel.
If you find that each of these fuses have power on both sides, then also check the RADIO BATT fuse in the underhood fuse block.
If all of that is ok, then it will be time to check some signals at the control module itself.
Please let me know what you find so we can proceed, if needed.
Take Care, Greg A.
You are quite welcome & I'm glad I could help.