Test Description

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

2. This step ensures that the primary HVAC system is functioning properly.
5. Performing the Air Conditioning System Performance Test ensures that the A/C system is operating properly for further testing.

Fig 1: Diagnosis Procedure Too Hot In Vehicle - Auxiliary (A/C Only)
Courtesy of GENERAL MOTORS CORP.