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It partly depends upon what sort of heater it is, but if it's a car heater, the valve alters the amount of hot water (from the car's cooling system) entering the heater matrix. This would also be true of a water-filled central heating system.
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Antifreeze/CoolantCooling FanPressure CapCoolant ReservoirHeater CoreHeater Control ValveEngine HeaterHVAC Hoses & ValvesHVACThermostat Description: A heater control valve may be located in one of the heater hoses to regulate coolant flow to the heater core. The valve is usually vacuum-controlled, which is operated by controls on the dash. Purpose: The valve is used help control heater output. Maintenance Tips/Suggestions:Insufficient heat, or heat that can�t be turned off may indicate a problem with the heater control valve. Inspect the valve to make sure that its vacuum line is properly connected. If the valve has an external linkage arm, operate the heater controls and watch to see if the valve changes position. If you have any doubts about the valve�s operation, have the heating system checked by a qualified service professional. http://www.carcare.org/Cooling_System/control_valve.shtml
