Possible Causes
WARNING: This page is about a different car, the 2002 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
Malfunction is detected when engine coolant temperature is excessively high under normal engine speed. Possible causes are:
- Cooling fan circuit open or shorted.
- Defective cooling fan.
- Defective thermostat.
- Improper ignition timing.
- Defective Engine Coolant Temperature (ECT) sensor.
- Blocked radiator.
- Blocked front end.
- Improper mixture ratio of coolant.
- Damaged bumper.