How to Remove and Replace a Heater Control Valve
https://www.yourmechanic.com/article/how-to-remove-and-replace-a-heater-control-valve-by-richard-zeppetini
WEBAug 25, 2016 · The purpose of a heater control valve is to control the flow of engine coolant to the heater core, located within the passenger compartment. When the heater or defroster is turned on, warm engine coolant passes through the heater core.
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