Four Seasons 74634 HVAC Heater Control Valve

Four Seasons 74634 Heater Control Valve

The Four Seasons Heater Valve 74634 is an OE replacement HVAC heater control valve built for cable-operated temperature control systems. It uses a pull-to-close, non-bypass design with two hose connectors and a 0.625 in. (15.875 mm) opening for direct-fit service on select Acura and Honda applications.

Key Features

• Cable-operated heater control valve for manual coolant flow control
• Pull-to-close, non-bypass design
• Plastic construction
• Two hose connectors
• 0.625 in. / 15.875 mm opening size
• OE replacement design for factory-style fitment

Product Details

Four Seasons Heater Valve 74634 is part of the Heater Valve line and is engineered as an OE replacement HVAC heater control valve. It is designed for cable operation, which means the valve responds to the vehicle’s heater control cable rather than an electronic actuator. This part number 74634 is used in select 2003-2007 Honda Accord, 2008-2010 Acura TSX, and 1988-1991 Honda Prelude heater valve applications. This part cross-references UAC HV1219C for the same application.

The Four Seasons 74634 heater valve is a direct-fit service part for vehicles that use a non-bypass coolant routing setup. It is a practical choice when replacing a worn or sticking heater control valve on a Honda Accord, Acura TSX, or Honda Prelude with cable-controlled HVAC temperature operation.

Common Problems This Part Can Address

• No heat or inconsistent cabin heat output
• Coolant flow not responding to the temperature control cable
• Heater valve sticking open or closed
• Coolant leakage at the heater valve assembly
• Improper heater core coolant routing in non-bypass systems

Installation Notes and Tips

Verify hose size, cable operation, and valve orientation before installation. This heater control valve uses two hose connectors and a 0.625 in. opening, so matching the existing hose routing is important for proper operation. Confirm vehicle fitment by year, make, and model before ordering, especially on 2003-2007 Honda Accord, 2008-2010 Acura TSX, and 1988-1991 Honda Prelude applications.

Quality Assurance

Four Seasons supplies OE-style HVAC replacement components, and this heater valve is built to match factory application requirements for the listed vehicles. Part number 74634 is an OE replacement heater control valve for service use on the specified Honda and Acura fitments.