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Heater Tap 1.We supply auto air conditioning part-Heater Valves, applied for American cars, Asian cars and European cars. 2.The purpose of the Heater Control Valve is to regulate the flow of coolant to the heater core. In the off position the heater valve blocks coolant flow to the heater core hence when no heating is required and the reverse when heating inside the vehicle is needed. 3.The heater valve can be activated by vacuum control in late model vehicles and cable in earlier models.