Circuit/System Testing
- Ignition OFF, inspect the cooling system for the following conditions:
- Weak coolant solution
- Obstructed radiator air flow or bent radiator fins
- Blocked cooling system passages
- Radiator hoses that are restricted, collapsed, or deteriorated
- Damaged water pump
- Loss of cooling system pressure
- Leaking surge tank cap
- Leaking radiator hoses
- Cylinder head or an engine block that is cracked or plugged
- If you find any of the above conditions, repair as necessary.
- If all conditions test normal, replace the E41 Engine Coolant Thermostat Heater.