Test Description

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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. If the condition does not occur when a heating request has been made then you must bypass the A/C compressor and cooling system diagnostic information.

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