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Ambient Air Temperature Update Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The HVAC control module will not request compressor clutch engagement when the ambient air temperature display is less than 5°C (40°F). In order to inspect compressor clutch operation during cold weather conditions, the vehicle must be brought inside and the ambient air temperature display must be updated. To update the ambient air temperature display on the HVAC control module, perform the following procedure:

  1. Turn ON the ignition.
  2. Simultaneously press the MODE, FRONT DEFROST and REAR DEFROST switches.
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