Engine Overheating

Engine Overheating

Diagnostic Aids

The engine may overheat due to an intermittent operation of one of the following components:

* The after boil heater pump
* The coolant bypass solenoid
* The coolant bypass valve
* The mechanical cooling fan
* The electric cooling fans
* The thermostat


For electrical inspection of the cooling fans and the after boil heater pump, refer to Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics) .