Thermostat Housing

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In many internal combustion engines the thermostat housing acts as the coolant outlet, it is normally located on the engine block or cylinder head. Engine coolant is constantly flowing, it flows through ports located in the block and head; it travels through these two components, through the thermostat housing and into the radiator where the coolant is cooled. As the name implies, this engine component houses the thermostat which regulates the coolant flow.