GM Service Manual Online
For 1990-2009 cars only

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

    â€¢  Cooling Fan Circuit Diagnosis
    â€¢  Engine Overheating
    â€¢  Loss of Coolant
    â€¢  Thermostat Diagnosis
    â€¢  Coolant Heater Inoperative
    â€¢  Engine Fails To Reach Normal Operating Temperature