Thermostat Housings, Filler Necks, Restrictors & Water Outlet Housings

The thermostat housing holds the thermostat in place on the engine intake manifold and also provides a connection to the upper radiator hose. This allows the water pump to properly circulate coolant/antifreeze and to maintain the proper engine operating temperature.

If the thermostat housing is leaking and a replacement gasket or re-torqueing of the housing mounting bolts will not resolve the issue, the thermostat housing may be defective and in need of replacement. If you would like to upgrade the current housing with a more aesthetically pleasing piece, you can choose an aluminum or performance stainless steel thermostat housing.

Water restrictors regulate the flow of coolant through the engine and radiator in order to control temperature. They are installed in place of the thermostat and are used primarily on racing engines. Typically, several are offered in a set with different size holes. This allows testing until the correct size is found that properly keeps your engine at optimum temperature.

The water flow restrictor is removed with the same method as removing a thermostat. The thermostat housing is detached from the intake manifold after disconnecting the radiator hose and disassembly of any parts in the way of the housing. This will give you access to the water flow restrictor for removal.

A JEGS expert is ready to answer your questions and help you find the water outlet housing that you require for your specific car, truck, SUV, or custom application.