GM Service Manual Online
For 1990-2009 cars only

EI06031 - HVAC Unable to Change Modes or Temperature, Inoperative, Poor A/C Performance (Reprogram HVAC Control Module)

Subject:EI06031 -- HVAC Unable to Change Modes or Temperature, Inoperative, Poor A/C Performance (Reprogram HVAC Control Module)

Models:2005-2006 Buick Terraza
2005-2006 Chevrolet Uplander
2005-2006 Pontiac Montana SV6
2005-2006 Saturn Relay



This bulletin is being revised to update the calibration information. Please discard Corporate Bulletin Number 06-01-39-004D (Section 01 - HVAC).


Condition

Some customers may comment that they are unable to change the HVAC mode and/or temperature. Customers may also comment that the A/C may be inoperative or have poor performance.

Cause

Engineering has determined based on technician feedback that this concern may be caused by not having the updated HVAC control module software or due to a communication issue between the temperature door actuator and the control head.

Correction

Reprogram the HVAC Control Module with the latest calibration set to correct this issue.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

D4707

HVAC Control Head Module or Assembly Reprogramming with SPS

0.4 hr