Heater Coolant Control Valve 5Pin for 2004-2009 Toyota Prius 1.5L L4 16670-21010

Heater Coolant Control Valve for Toyota Prius

This 5-pin heater coolant control valve regulates coolant flow through the cabin heater core, cross-referencing OEM part number 16670-21010 for a direct-fit replacement.

Overview

This heater coolant control valve is a 5-pin electric unit that manages coolant circulation to the heater core so cabin temperature stays consistent. It is built to match the original fit and function for the Toyota Prius 1.5L L4, giving drivers a dependable replacement for a failed or leaking valve. The heater coolant control valve installs at the factory location and connects with the existing 5-pin harness.

Built For Performance

• 5-pin electrical connector matches the factory harness for plug-and-play installation
• Direct-fit replacement cross-referenced to OEM part number 16670-21010
• Housing designed to seal coolant flow and prevent leaks under operating pressure
• Internal valve rated for continuous hot coolant circulation
• Construction resists corrosion from prolonged coolant exposure

Fits These Machines

• for Toyota Prius 1.5L L4 2004
• for Toyota Prius 1.5L L4 2005
• for Toyota Prius 1.5L L4 2006
• for Toyota Prius 1.5L L4 2007
• for Toyota Prius 1.5L L4 2008
• for Toyota Prius 1.5L L4 2009

On-The-Job Use

• Restores cabin heater output when the original valve sticks or fails
• Stops coolant leaks at the valve body that cause low coolant levels
• Replaces a valve that throws heater control codes on the 5-pin circuit
• Routine cooling system repair on high-mileage Prius models

Specs At A Glance

Good To Know

Q: Will this valve fix a no-heat condition? A: If the original valve is stuck closed or failed, replacing it restores coolant flow to the heater core and brings back cabin heat. Confirm the 5-pin connector and part number 16670-21010 match before ordering.

Q: Do I need to drain the cooling system to install it? A: Yes, the cooling system should be drained below the valve level before removal to avoid coolant loss and air pockets. Refill and bleed the system afterward for proper heater operation.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.