For 1990-2009 cars

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, an automatic re-calibration of all the actuators will occur. For the best re-calibration results, start and run the engine for at least one minute after installing the new module . Do not adjust any controls on the HVAC control module during the re-calibration procedure. If interrupted, improper HVAC performance may result. No additional procedures are necessary.

### HVAC Control Module Reprogramming

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

Reprogram HVAC Control Module--Refer to Service Programming System (SPS) .