Front

WATER VALVE (FRONT)

A vacuum-actuated water valve is installed in the heater hose between the engine and the front heater core in the engine compartment. Vacuum to the front heater core water valve is controlled by the rotary-type mode control vacuum switch in the heater-only or heater-A/C control.

The front water valve is a normally-open valve used to control engine coolant flow through the heater core. When vacuum is applied to the integral water valve vacuum actuator, the actuator closes the valve and coolant flow through the heater core is stopped. When the water valve is opened (no vacuum is applied), the coolant flows through the heater core and back to the engine.

The front water valve cannot be repaired and, if faulty or damaged, it must be replaced.