Engine Overheating (Possible Causes)
PRELIMINARY DIAGNOSIS1. Does overheating occur while pulling a trailer? Is the trailer within the recommended towing weight?
2. Is overheating occurring after prolonged idle in gear, A/C system operating?
3. Is overheating occurring after prolonged driving in slow city traffic, traffic jams, parades, etc.? If none of the above apply refer to the table below.
ENGINE OVERHEATING (POSSIBLE CAUSES)
1. Verify that the cooling system is properly filled.
2. If the complaint is a low temperature gauge reading, check the temperature gage 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, Ventilation and Air Conditioning.
6. Verify the proper operation of the thermostat.