The valve is located in the engine compartment, attached to the firewall. Disconnect the heater hoses, control cable and remove the retaining screws.
The heater control valve is part of the heater core inlet. To replace the control valve, remove the heater core as outlined in this Section. Remove the control valve from the heater core, being careful not to damage the core. Use new gaskets when installing new valves.
The remainder of the vehicles are not equipped with heater water control valves. They use heater unit doors to regulate the amount of heat entering the vehicle.