Hello everyone newbie here. I have a 99 grand prix with the digital dual climate control. past year or so A/C works great sometimes and sometimes not so great. I was wondering if there is a thermometer inside the car somewhere that may be going bad? What tells the computer air inside the cab has reached the chosen temp setting? How does the computer know to automatically adjust the heat-A/C based on the temp chosen on the digital display? Checked freon its fully charged compressor is on. Ambient sensor reads outside temp correctly? Any help would be great. Thanks!
