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The power is supplied by a transformer, and when the thermostat makes contact between the 24 volt power and one or two of the other wires, a relay back at the heating/cooling unit activates the corresponding heat/fan/cool function of the unit(s).
The main purpose of a thermostat housing is to contain the engine thermostat and provide a coolant outlet to the radiator.In some cases, each radiator hose will be connected to a similar looking housing, with one serving as a coolant inlet and the other as an outlet. fiber gasket will typically be used to connect the thermostat housing to the block or intake manifold, though plastic and rubber gaskets also exist.