Hi, My battery on my Bonniville SSE (97) has been disconnected twice. Each time the heater will blow only cold air and the temp read starts to blink. The 1st time it would blow hot air then it would start to blink and start blowing faster and cold air. This time is the same. If I turn the car off and sart it again it would blow hot air then but not everytime. Rick
You need to retrieve the BCM (Body Control Module) faulty code with a scanner. Fix any code that you find.
Try to erase any code and see if the problem is solved.
Hope it helps.
SOURCE: heater
on most gm models there is a door like a flap that opens to let the heat flo threw and closes for the a/c to work some were electronic and some were vacuum type you should be able to access it on the passenger side under the dash i had same problem b4
SOURCE: how to replace the stop
go into ur trunk,,,pull back the panel,,undue the twist caps that hold your tail light assembly to the back of your car,,,
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