AITKEN HVAC Heater Control Valve Coolant Flow Control Valve Compatible with Toyota Prius 2004 2005 2006 2007 2008 2009 4 Cyl 1.5L P/N 1667021010 601-021.

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• Heater Control Valve (commonly called Heater Water Valve, Warm Water Valve, or Heater Valve) regulates hot coolant flow to the heater core, Therefore, it can also be called a coolant flow control valve. Mounted in the engine’s cooling system, it controls cabin temperature by opening/closing to allow/disrupt heated coolant circulation. Essential for defrosting and passenger comfort in cold weather.
• Heater Control Valve Common Faults: No Heat: Valve stuck closed, cable/linkage disconnected, actuator failure, or vacuum line leak (vacuum types). Constant Heat: Valve stuck open, debris blocking closure, or electrical short (motorized types). Partial Heating: Valve partially obstructed, weak actuator, or low voltage. Electrical Issues: Blown fuse, broken wiring, or failed solenoid/motor. Internal Leak: Seal wear causing coolant bypass when "closed.
• Premium Heater Control Valve: Engineered to exact OEM specifications for perfect fitment and reliable performance. Manufactured with high-grade materials for corrosion resistance and leak-free operation. Rigorously endurance-tested under extreme temperatures and pressure cycles to ensure long-term durability. Backed by a 12-month warranty and dedicated technical support. Trusted by professionals for seamless integration and sustained cabin comfort.
• OEM / Interchange Numbers: 16670-21010, 601-021
• Compatible vehicle models: Toyota Prius 2004-2009