Abstract: A liquid cooling system for an internal combustion engine includes a coolant pump, an air-to-liquid heat exchanger, and a bypass loop for allowing coolant to circulate from the coolant pump to the engine without passing through the heat exchanger. A thermostatic valve mounted within a thermostat housing and including a temperature-responsive primary valve element and bypass flow control will control the flow of coolant with a spring-loaded valve disc having a conical, annular sealing surface configured for linear contact with the valve seat.

Abstract: A thermostat cartridge assembly 14 for a cooling system 10 of an automotive vehicle 12 including a housing 50. The housing 50 includes a first opening 62, a second opening 68, and a direct-flow opening 72. A thermostat mechanism 80 located at least partially within the housing 50 adjusts the amount of coolant flowing between the first opening 62, the second opening 68, and the direct-flow opening 72. An attachment mechanism 52 attaches the thermostat cartridge assembly 14 to the cooling system 10. A releasing mechanism 54 engages and disengages the thermostat cartridge assembly 14 to and from the cooling system 10.