The primary function of a thermostat is to maintain a minimum operating temperature in the car's engine. When the engine is started, the antifreeze and coolant mixture is kept within the engine by the thermostat. It opens upon reaching a specified temperature. Coolant will then flow through the radiator to keep the engine at a temperature close to the rated temperature of the thermostat. Three main thermostat types are currently available in the Valeo range:
1 Conventional wax thermostats:
2 Electrically heated wax thermostats:
3 Electrically actuated thermostats:
Thermostat Failure The thermostat can stick shut if the wax element has been damaged by previous overheating, corrosion or age. If the thermostat fails to close, the constant flow of coolant through the thermostat will prevent the engine from reaching the normal operating temperature. This can cause poor drivability in cold weather, a sharp increase in fuel consumption, little or no heater output, etc. The thermostat also has to be replaced in the event of water pump replacement.
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