2003 climet control turn on heat from cold and it take a day or so to change

Asked by Jun 19, 2012 at 01:44 PM about the 2003 Pontiac Grand Am GT Coupe

Question type: Maintenance & Repair

1 Answer

102,335

The HVAC unit uses vacuum to open and close doors that control the heat. The heater core is always hot if coolant is flowing. The temperature control closes a door that lets cold air bypass the heater core. Check to see if you have vacuum to the control panel. [IMG]http://i17.photobucket.com/albums/b72/tenspeed/wiring/service%20manu al/HVAC010.jpg[/IMG]

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