Four Seasons 74677 HVAC Heater Control Valve - Front

Heater Valve for Dodge Truck HVAC Control

Four Seasons Heater Valve 74677 is a cable-operated, non-bypass HVAC heater control valve built as an OE replacement for classic Dodge truck applications. It uses a steel body with two hose connectors and is specified for front heater use on select 1974-1981 Dodge D100, D150, D200, D250, D300, D350, W100, W150, W200, W250, W300, W350, and Ramcharger models.

The Four Seasons heater valve line focuses on direct-fit temperature control components for vehicle HVAC systems. Part number 74677 follows the original cable-operated layout and non-bypass style used on the listed Dodge applications, making it a practical choice when restoring heater control function on older trucks and Ramcharger models.

• Cable-operated HVAC heater control valve
• Non-bypass style for direct heater flow control
• Steel construction
• Two hose connectors
• OE replacement design
• Opening sizes: 0.500 in (12.700 mm) and 0.625 in (15.875 mm)

Detailed Product Description

Four Seasons 74677 is an HVAC heater control valve designed to regulate coolant flow through the heater circuit using a cable-operated mechanism. The non-bypass configuration and OE replacement design align with factory-style heater control systems found on select Dodge D-series trucks, W-series trucks, and Ramcharger models. If you are replacing a worn or sticking heater valve on a 1975-1977 Dodge W100 or a 1980-1981 Dodge D150, this part number provides the correct style and connector layout for the application.

This part cross-references TYC 30209 and Eastern Catalytic 20422 for the same application. Four Seasons part number 74677 is also referenced by several interchange numbers used in the aftermarket cataloging system.

Vehicle Fitment

• Fits 1974-1977 Dodge Ramcharger, front; heater valve.
• Fits 1975-1977 Dodge D100, front; heater valve.
• Fits 1975-1977 Dodge D200, front; heater valve.
• Fits 1975-1977 Dodge D300, front; heater valve.
• Fits 1975-1977 Dodge W100, front; heater valve.
• Fits 1975-1977 Dodge W200, front; heater valve.
• Fits 1975-1977 Dodge W300, front; heater valve.
• Fits 1977 Dodge D150, front; heater valve.
• Fits 1977 Dodge W150, front; heater valve.
• Fits 1978-1979 Dodge D100, front; compatible with models that do not have air conditioning; heater valve.
• Fits 1978-1979 Dodge D150, front; compatible with models that do not have air conditioning; heater valve.
• Fits 1978-1979 Dodge D200, front; compatible with models that do not have air conditioning; heater valve.
• Fits 1978-1979 Dodge D300, front; compatible with models that do not have air conditioning; heater valve.
• Fits 1978-1979 Dodge Ramcharger, front; compatible with models that do not have air conditioning; heater valve.
• Fits 1978-1979 Dodge W150, front; compatible with models that do not have air conditioning; heater valve.
• Fits 1978-1979 Dodge W200, front; compatible with models that do not have air conditioning; heater valve.
• Fits 1978-1979 Dodge W300, front; compatible with models that do not have air conditioning; heater valve.
• Fits 1980 Dodge D100, front; heater valve.
• Fits 1980 Dodge D200, front; heater valve.
• Fits 1980 Dodge D300, front; heater valve.
• Fits 1980 Dodge W200, front; heater valve.
• Fits 1980 Dodge W300, front; heater valve.
• Fits 1980-1981 Dodge D150, front; heater valve.
• Fits 1980-1981 Dodge Ramcharger, front; heater valve.
• Fits 1980-1981 Dodge W150, front; heater valve.
• Fits 1981 Dodge D250, front; heater valve.
• Fits 1981 Dodge D350, front; heater valve.
• Fits 1981 Dodge W250, front; heater valve.
• Fits 1981 Dodge W350, front; heater valve.

Common Repair Uses

• Restores heater temperature control on Dodge D100, D150, D200, and D300 trucks
• Addresses a heater valve that sticks open or closed
• Helps correct weak or inconsistent cabin heat
• Replaces a leaking or corroded steel heater valve
• Supports repair of cable-operated HVAC control systems

Installation Notes and Tips

Verify the valve style, hose connector count, and opening sizes before installation. This part uses a cable-operated, non-bypass design, so it should be matched to the original HVAC control setup on the vehicle. Confirm hose routing and cable travel on the Dodge D-series, W-series, or Ramcharger application before final assembly.

Quality Assurance

Four Seasons Heater Valve 74677 is an OE replacement HVAC component built for direct-fit service on the listed applications. The Four Seasons heater valve line is cataloged for temperature control repair work in automotive HVAC systems, including classic Dodge truck heater service.