4.2 ThermostatThe thermostat controls the coolant temperature by regulating coolant flow to the radiator. A thermostat stuck open will cause the engine to warm up slowly and run below normal temperature at highway speed. A thermostat stuck closed will restrict coolant flow to the radiator and cause overheating. Replacement is only necessary if the thermostat is faulty. In addition to the tools required for draining the coolant, a wrench or a socket is required to remove the thermostat housing. Use a new O-ring, Volkswagen Part No. 059 121 119, when the thermostat housing is reinstalled. |
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