Pontiac Problems? Ask a Mechanic for Answers ASAP
Hello, my name is***** what has been done it sounds like your computer needs to be reflashed. The most common cause is the thermostat, I'd consider replacing thermostat with OEM AC Delco Brand if you haven't already and after that have computer reflashed. Here is a copy of the bulletin related to reflash. Let me know if you have more questions, thanks.