Engine Overheating
Preliminary DiagnosisVerify that overheating is not caused by the following conditions:
1. While pulling a trailer that is within the recommended towing weight.
2. After prolonged idle in gear, with the A/C system operating.
3. After prolonged driving in slow city traffic, traffic jams, parades, etc.
If these conditions can be eliminated as the cause of overheating, refer to the table below.
Engine Overheating
1. Verify that the cooling system is properly filled.
2. If the complaint is a low temperature gauge reading, check the temperature gauge for proper operation. Connect a Scan Tool to the vehicle and read the system temperature.
3. Compare this reading to the temperature gauge.
4. Replace the gauge or switch if necessary.
5. If the complaint is no heat from the Heating and Air Conditioning system, refer to Heating Insufficient in Heating and Air Conditioning.
6. Verify the proper operation of the thermostat.