A/C - Unable To Change A/C Modes

Bulletin No.: 06-01-39-006

Date: July 12, 2006

TECHNICAL

Subject:
Unable To Change HVAC System Modes (Update HVAC Control Module Software)

Models:
2006 Chevrolet Impala, Monte Carlo

with Manual Control HVAC System (RPO CJ3) or Automatic Control HVAC System (RPO C67)

Condition

Some customers may comment that they are unable to change the modes in their Heating, Ventilation and Air Conditioning (HVAC) system or that the air is misdirected from the selected mode. The system will reset itself if turned to the defrost mode but the lockup could occur again when moved to other modes.

Cause

This condition may be caused by a logic lock-up in the HVAC control module.

Correction





Technicians are to reprogram the HVAC control module with an updated software calibration. The new calibration was released beginning with TIS satellite data update version 6.5 which was made available on June 12, 2006. As always, make sure your Tech 2(R) is updated with the latest software version.

It is recommended that the HVAC actuators be recalibrated after the HVAC control module software is updated. Refer to Re-Calibrating Actuators in the HVAC section of SI for more information.

Warranty Information





For vehicles repaired under warranty, use the table.





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