GM Service Manual Online
For 1990-2009 cars only

Because the cable and the cable housings have fixed lengths, it is impossible to make a temperature cable adjustment.

Remove the Instrument Panel compartment. Refer to Instrument Panel Storage Compartment Replacement in Instrument Panel, Gages, and Console.

If a malfunction is suspected, verify the proper operation of the controller and the mechanical doors for the heater/air distributor case assembly.