Norton1

Oh yeah - my 94 STS did the same thing. Ended up being the high side limiter switch. It's one of those special pressure switches that you can remove from the AC line and replace by yourself without purging the system. It's up on the firewall right at the back of the hood. Has a single wire running to it. If that is what it is - don't buy one - I've got a spare (we just moved so I'll look for it tonight). I'll give it to you. Just let me know the part number so I know I'm sending you the correct one. I'll look through my mauals tonight to make sure the above info is correct. And don't feel bad - two GM techs went nuts on my car and they couldn't figure it out - I did by accident (and a lot of leafing through manuals that make no sense at times). And you check voltage by putting the red test lead on the pin in question and the black lead on any solid ground - metal part connected to the body/frame. Steve