Bad low coolant switch or still low on coolant.
Engine Cooling
The cooling system components are the:
The water pump circulates the coolant.
The water thermostat:
The degas bottle:
The fan motor (8C607):
The engine coolant flows:
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:
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