Heater Control Valve: Description and Operation

Dual Coolant Control Valve:

The dual coolant valve regulates the flow of engine coolant to each half of the heater core. Two electric solenoids, Which are individually actuated by the heater control module, are the control elements. The valve contains five ports:

inlet port - coolant from the engine

outlet port - coolant to driver side of heater core

outlet port - coolant to passenger side of heater core

return port - common coolant return from heater core

outlet port - coolant return to engine