GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2000 🢒 Bonneville 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Symptoms

Important: The following steps must be completed before using the symptom tables:

  1. Perform the Diagnostic System Check before using the Symptom Tables in order to verify that all of the following are true:
    2. • There are no DTCs set.
    • The control module(s) can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
    3. •  Air Conditioning (A/C) System Description
    •  Control Assembly Description
    •  Operating Modes

Visual/Physical Inspection
    • Inspect for aftermarket devices which could affect the operation of the HVAC System. Refer to Checking Aftermarket Accessories in Wiring Systems.
    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

    •  HVAC Compressor Clutch Does Not Engage
    •  HVAC Compressor Clutch Does Not Disengage
    •  Blower Motor Does Not Operate Properly
    •  Cooling Insufficient - Air Conditioning (A/C) System
    •  Defrosting Insufficient
    •  Too Cool in Car
    •  Air Delivery Improper
    •  Temperature Variation Between Driver and Passenger Outlets
    •  Improper Control Response
    •  Heating Insufficient in Heating, Ventilation, and Air Conditioning
    •  Noise Diagnosis - Blower Motor in Heating, Ventilation, and Air Conditioning
    •  Noise Diagnosis - Air Conditioning (A/C) System in Heating, Ventilation, and Air Conditioning
    •  Odor Diagnosis in Heating, Ventilation, and Air Conditioning