Four Seasons 74623 HVAC Heater Control Valve

Four Seasons 74623 Heater Valve Overview

The Four Seasons Heater Valve 74623 is an OE replacement HVAC heater control valve built for cable-operated temperature control systems. It uses a non-bypass design with two hose connectors and a 0.625 in. (15.875 mm) opening for direct coolant flow control in the heater circuit.

Compatible With 1984-1987 Honda Civic and 1986-1989 Acura Integra heater valve applications, this Four Seasons 74623 part number is a direct-fit option for restoring cabin heat control. Four Seasons Heater Valve line components are built for replacement use where the original valve is cable actuated and non-bypass in design.

Key Features

• OE replacement HVAC heater control valve
• Cable-operated open valve design
• Non-bypass style for heater circuit control
• Plastic construction
• Two hose connectors
• 0.625 in. / 15.875 mm opening
• Direct replacement for select Honda Civic and Acura Integra applications

Product Details

Four Seasons 74623 is a cable-operated heater valve designed to regulate coolant flow through the heater core on select import vehicles. The non-bypass configuration means the valve controls flow through the heater circuit without routing coolant around it, which is important for systems originally equipped with this style. If you are replacing a worn or leaking heater valve on a Honda Civic or Acura Integra, this part number 74623 provides the correct OE-style layout for the listed applications.

This part cross-references Honda and aftermarket numbers such as 39270SD2003 and 800502 for the same application.

Vehicle Fitment

• Fits 1986-1989 Acura Integra, Heater Valve
• Fits 1984-1987 Honda Civic, Heater Valve

Common Issues This Part Can Address

• Loss of cabin heat due to a stuck heater valve
• Coolant leakage at the heater control valve body
• Improper temperature control from a failed cable-operated valve
• Restricted heater core coolant flow
• HVAC heat output that does not respond correctly to the control cable

Installation Notes and Tips

Verify the vehicle uses a cable-operated, non-bypass heater valve before installation. Match the hose connection layout and opening size to the original part, and inspect the control cable movement, hose condition, and coolant lines for wear or damage during replacement. Bleed the cooling system after service to help restore proper heater performance.

Quality Assurance

Four Seasons 74623 is an OE replacement heater valve intended to match the original application requirements for listed Honda Civic and Acura Integra models. Confirm part number 74623 against the existing valve and vehicle build details before ordering.