Four Seasons 74858 HVAC Heater Control Valve

Four Seasons 74858 Heater Valve Overview

Four Seasons 74858 is an OE replacement HVAC heater control valve built for vacuum-operated, non-bypass heater circuits. It uses a plastic body with two hose connectors and a 0.625 in. (15.875 mm) opening to help regulate coolant flow through the heater core.

Compatible With Ford Ranger, Explorer, Explorer Sport Trac, Expedition, Lincoln Navigator, Mercury Mountaineer, and Ford E-Series applications that use a 2-port heater valve. This Four Seasons heater valve is a direct-fit service part for restoring cabin heat control on the listed vehicles.

Key Features

• Part number 74858
• Vacuum closes non-bypass heater valve design
• Vacuum-operated function for heater coolant control
• Two hose connectors for 2-port applications
• Plastic construction
• OE replacement style for factory-type service
• 0.625 in. / 15.875 mm opening

Product Details

The Four Seasons Heater Valve line is built for temperature-control service in HVAC systems where coolant flow must be routed through a vacuum-actuated valve. Part number 74858 is specified as a non-bypass style valve, meaning it controls heater flow without a bypass path. That makes it a practical replacement for Ford Ranger and Ford Explorer heater valve service, as well as related Explorer Sport Trac, Mountaineer, Expedition, Navigator, and E-Series applications listed in the fitment data.

This part cross-references Hayden 5970 and Global Parts Distributors LLC 8211251 for the same application.

Common Problems This Part Can Address

• No heat from the vents when the heater valve is stuck closed
• Heat that will not shut off when the valve no longer responds to vacuum
• Coolant flow issues through the heater core on 2-port systems
• Temperature control problems caused by a leaking or cracked valve body
• HVAC performance issues on vacuum-controlled heater circuits

Installation Notes and Tips

Verify the vehicle uses a 2-port, vacuum-operated heater valve before ordering. Compare the original valve body, hose routing, and connector layout to confirm the opening size and non-bypass configuration match the existing part. On some Ford Explorer, Explorer Sport Trac, and Mercury Mountaineer applications, physical comparison is noted in the fitment data and should be completed before installation.

Fits 2005-2011 Ford Ranger, heater valve; Fits 2004-2010 Ford Explorer, w/ 2-Port Valve; heater valve; Fits 2007-2010 Ford Explorer Sport Trac, w/ 2-Port Valve; heater valve; Fits 2002-2010 Mercury Mountaineer, w/ 2-Port Valve; heater valve; Fits 2003-2006 Ford Expedition, heater valve; Fits 2003-2006 Lincoln Navigator, heater valve; Fits 1984-1989 Ford E-150 Econoline, heater valve; Fits 1984-1989 Ford E-150 Econoline Club Wagon, heater valve; Fits 1984-1989 Ford E-250 Econoline, heater valve; Fits 1984-1989 Ford E-250 Econoline Club Wagon, heater valve; Fits 1984-1989 Ford E-350 Econoline, heater valve; Fits 1984-1989 Ford E-350 Econoline Club Wagon, heater valve.

Quality Assurance

Four Seasons supplies OE replacement HVAC components for temperature-control service, and this valve is built to match the listed factory-style application requirements for the vehicles shown above.