ENGINE COOLING SYSTEMS

摘要

A heater diverter valve (20) is provided in an engine cooling system having a radiator, a pump to circulate coolant through an engine supply line to the engine, from the engine to the radiator and from the radiator back to the pump through a pump return line. The valve has a first inlet (31) connected to a heater so that coolant which flows from the engine supply line through the engine and then through the heater is returned to the pump return line through the valve via the first inlet and an outlet (33). A second inlet (32) is connected to engine and transmission oil coolers so that coolant which flows from the engine supply line through the coolers is returned to the pump return line via the second inlet and the outlet. The valve includes a shuttle (24) having a valve member (25) which at lower coolant temperatures closes off the second inlet (32) to prevent coolant flow thorough the oil coolers. The second inlet (32) is opened at higher temperatures when a wax type thermal actuator pushes the shuttle towards the first inlet (31).