Thermostat Housing Plug

The thermostat housing protects the thermostat and allows coolant to flow between the engine and cooling system. It is usually made of plastic and can wear out over time. If you have coolant leaking from the housing plug, it is possible to replace the plug instead of the entire housing. However, depending on the nature of the leak, the coolant acidity may also damage the housing, which may lead to thermostat damage. O'Reilly Auto Parts carries thermostats, thermostat housings, and thermostat plugs for a complete repair.