bad low coolant switch or still low on coolant.
The cooling system components are the:
- engine coolant temperature sensor (ECT sensor) (12A648)
- radiator (8005)
- degas bottle (8A080)
- radiator draincock (8115)
- water pump (8501)
- water temperature indicator sender unit (10884)
- water thermostat (8575)
- dual speed fan motor assembly
The water pump circulates the coolant.
The water thermostat:
- controls the engine coolant temperature.
- allows quicker engine warm-up.
The degas bottle:
- provides a location for fill.
- contains coolant expansion and system pressurization.
- provides air separation during operation.
- replenishes the engine coolant to the system.
The fan motor (8C607):
- operates only when the ignition switch is in the RUN position.
- will not operate with the switch in the OFF position.
The engine coolant flows:
- from the lower radiator hose (8286) to the water pump.
- from the water pump to the engine block and the cylinder heads.
A closed water thermostat returns the engine coolant to the water pump; an open water thermostat allows the engine coolant to flow to the radiator.
Engine coolant provides freeze protection, boil protection, cooling efficiency and corrosion protection to the engine and cooling components. In order to obtain these protections, the engine coolant must be maintained at the correct concentration and fluid level in the degas bottle.
When adding engine coolant, use a 50/50 mixture of clean, drinkable water and engine coolant.
To maintain the integrity of the coolant and the cooling system: