Toyota 16670-21010 Coolant Control Valve With Bracket

Toyota 16670-21010 Coolant Control Valve With Bracket is an OEM electric valve assembly that precisely regulates coolant flow between the engine, heater core, and hybrid cooling circuits in Toyota Prius Gen 2 1.5L hybrids (2004–2009). This bracket-mounted unit uses an electric motor/solenoid actuation to control engine coolant routing, supporting efficient engine warm-up, improved cabin heating, and balanced hybrid thermal management. The valve features a reinforced plastic body with a metal bracket for engine bay mounting and is compatible with Toyota SLLC engine coolant/antifreeze. In stop-start operation, precise routing helps fuel efficiency, emissions performance, and drivability. Suitable for automotive hybrid cooling and HVAC applications under high-temperature coolant circulation, the valve is commonly replaced as part of engine temperature stability maintenance or heater performance restoration. Common replacements include the Toyota OEM 16670-21010 coolant control valve assembly, the Denso hybrid coolant flow control valve (Prius Gen 2 equivalent), and the Aisin bypass/heater control valve assembly for Prius 1.5L engines.