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Symptoms - HVAC Systems - Automatic: Notes

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Important:  Complete the following steps before using the symptom tables:

  1. Perform Diagnostic System Check - HVAC Systems - Automatic  before using the Symptom Tables in order to verify that all of the following conditions are true:
    1. 1.1 No DTCs are set.
    2. 1.2 The control modules can communicate via the serial data link.
  2. Review the system operation in order to become familiar with the system functions. Refer to the following procedures:
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