GM Service Manual Online
For 1990-2009 cars only

Each of the following service procedures may require programming or setup procedures to be performed on the HVAC control module or HVAC actuators.

HVAC Control Module Replacement

If the HVAC manual or HVAC Automatic control modules are replaced, the following procedure must be performed:

    • Re-calibrating actuators--Refer to Actuator Recalibration for the manual system.
    • Re-calibrating actuators--Refer to Actuator Recalibration for the automatic system.

For the best re-calibration results, do not adjust any controls on the HVAC control module during the re-calibration procedure. If interrupted, improper HVAC performance may result.

HVAC Control Module Reprogramming

Do not reprogram the HVAC control module unless directed by a service procedure or a service bulletin.

    • Re-calibrating actuators--Refer to Actuator Recalibration for the manual system.
    • Re-calibrating actuators--Refer to Actuator Recalibration for the automatic system.

For the best re-calibration results, do not adjust any controls on the HVAC control module during the re-calibration procedure. If interrupted, improper HVAC performance may result.

Actuator Replacement

If an actuator is replaced, the following procedure must be performed:

    • Re-calibrating actuators--Refer to Actuator Recalibration for the manual system.
    • Re-calibrating actuators--Refer to Actuator Recalibration for the automatic system.

For the best re-calibration results, do not adjust any controls on the HVAC control module during the re-calibration procedure. If interrupted, improper HVAC performance may result.