Your 1996 Volkswagen Passat engine needs to warm up first before you start your adventure on the road. The thermostat is the one that helps the engine reach the operating temperature faster through the restriction of the coolant flow through the radiator. This is a simple device that is mounted to a switch that turns on your heater. When it is cold, you can activate your heater. But then again, when the temperature is hot, the component you need to turn on is the air conditioning system in order to cool you down. The thermostat also employs an internal combustion engine in order to regulate the flow of the coolant. When the thermostat is open, the coolant will pass through the cylinder head where it looses the heat of the air that enters through it. Water, which is driven from the engine, will propel the coolant around the system. Meanwhile, when the thermostat is closed, the flow will be prevented and the engine is permitted to heat up to its optimum temperature. However, to correctly perform the function of the thermostat, it needs to have a reliable Volkswagen Passat Thermostat Housing. But this housing is manufactured in diecast alloy so it is easily subjected to corrosion. This is because water used in a cooling system is in conjunction with corrosion and will later on create a corrosive environment in the cooling system. So you can never guarantee to have a thermostat housing that will service you for life. Replacement is always imminent and when replacing this component, it is important to always opt for the G4010-89669 Febi Thermostat Housing present here in our site.