Four Seasons 74775 HVAC Heater Control Valve

Four Seasons 74775 Heater Valve Overview

The Four Seasons 74775 heater valve is an OE replacement HVAC heater control valve built for vacuum-operated heater circuit control. It uses a bypass style design with four 5/8 in. hose connectors and a plastic body for direct service in the heating and cooling system.

Compatible with select Chrysler, Dodge, and Plymouth applications, including Chrysler LeBaron, Dodge Shadow, Dodge Charger, Plymouth Reliant, and Plymouth TC3 models, this Four Seasons Heater Valve line part is built for vehicles that use vacuum control and bypass heater flow management.

Key Features

• Part number: 74775
• Vacuum closes bypass heater valve operation
• Bypass style heater valve
• Four hose connectors
• 0.625 in. / 15.875 mm openings
• Plastic construction
• OE replacement design
• Compatible with vacuum-operated HVAC systems

Detailed Product Information

The Four Seasons 74775 is an HVAC heater control valve designed to regulate coolant flow through the heater circuit based on vacuum input. Its bypass configuration and four-port layout support applications that require controlled routing of heater hose flow, while the 5/8 in. openings match common heater hose sizing used in the listed vehicles. This part cross-references National 30208 for the same application.

Use this heater valve on select 1980-1992 Chrysler, Dodge, and Plymouth models, including 1981-1982 Dodge Aries, 1981-1982 Plymouth Reliant, 1980-1983 Plymouth TC3, 1983-1987 Plymouth Turismo, 1983-1986 Plymouth Turismo 2.2, 1983-1984 Dodge Rampage, 1983-1986 Dodge Charger, 1991-1992 Chrysler LeBaron, and 1992 Dodge Shadow. The Four Seasons 74775 also appears under interchange references such as 5914 and 801702.

What This Heater Valve Helps Address

• Heater output stuck on or stuck off due to valve failure
• Vacuum-controlled heater flow problems
• Coolant routing issues in the heater circuit
• Incorrect heater hose valve operation on bypass systems
• Replacement needs for worn OE-style HVAC heater valves

Installation Notes and Tips

Verify the vehicle uses a vacuum-operated bypass heater valve before installation. Match the hose connector count, 5/8 in. opening size, and bypass configuration to the original part. Confirm fitment for the exact year, make, and model, especially on Dodge Rampage applications with air conditioning and Plymouth TC3 models with 4-port or non-A/C configurations.

Quality Assurance

Four Seasons supplies OE replacement HVAC components, and the 74775 heater valve is built to match the listed application requirements for vacuum control and hose connection layout.