This HVAC heater control valve is designed to match the fit and function of an original valve that has malfunctioned or failed. It is engineered to help ensure the proper flow of hot coolant through the heater core to create and regulate cabin heat. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Toyota Prius: 2004, 2005, 2006, 2007, 2008, 2009]