Heater Control Valve: Locations
FRONTFront Water Valve Remove/Install:
A vacuum-actuated water valve is installed in the heater hose between the engine and the front heater core in the engine compartment.
REAR
Rear Water Valve Remove/Install:
A cable-actuated rear water valve is located near the back of the rear unit housing. The rear water valve is installed in the rear unit heater hose between the engine and the rear combination coil.