Four Seasons 74780 HVAC Heater Control Valve

Four Seasons 74780 Heater Valve Overview

The Four Seasons 74780 is an OE replacement HVAC heater control valve for vehicles that use a cable-operated, non-bypass design. It regulates coolant flow to the heater core to help maintain consistent cabin heat in Acura, Honda, Lexus, and Toyota applications.

Built with a plastic body and two hose connectors, this heater valve uses a 0.625 in. (15.875 mm) opening and is specified as a cable-operated open non-bypass valve. Four Seasons Heater Valve 74780 is a direct-fit style replacement for select Honda Accord, Odyssey, Ridgeline, S2000, Acura MDX, CL, TL, Legend, and related Toyota and Lexus models.

Key Features

• OE replacement HVAC heater control valve
• Cable-operated open non-bypass design
• Plastic construction for common OEM-style applications
• Two hose connector layout
• 0.625 in. / 15.875 mm opening
• Direct replacement part number 74780

Product Details

Four Seasons Heater Valve line components are built for temperature control service in the HVAC system, where accurate coolant routing is needed for heater operation. Part number 74780 is designed for cable-actuated systems and matches the non-bypass configuration used on many older and late-model Asian vehicles. This part cross-references MAHLE 5863 and UAC HV1231C for the same application.

Common Uses

• Restores heater output when the valve is stuck closed
• Addresses inconsistent cabin temperature control
• Replaces a leaking or cracked heater valve body
• Corrects cable-actuated heater flow issues
• Helps resolve poor coolant routing to the heater core

Installation Notes

Verify hose size, cable operation, and valve orientation before installation. This valve is listed as a non-bypass style, so confirm the original system uses the same configuration. Some fitments note bracket differences or application-specific details, including 1993-1996 Toyota Camry with bracket not included and 1992 Toyota Camry with no bracket from 9/91. Confirm the vehicle’s heater control cable and hose routing match the original part before service.

Fitment

• Fits 2007-2010 Acura MDX, Heater Valve
• Fits 2001 Acura CL, Heater Valve
• Fits 1997-1999 Acura CL, Heater Valve
• Fits 1999-2001 Acura TL, Heater Valve
• Fits 1986-1990 Acura Legend, Cable Operated; Heater Valve
• Fits 2005-2010 Honda Odyssey, Heater Valve
• Fits 1995-1998 Honda Odyssey, Heater Valve
• Fits 2006-2009 Honda Ridgeline, Heater Valve
• Fits 2002-2009 Honda S2000, Heater Valve
• Fits 1986-2001 Honda Accord, Heater Valve
• Fits 2001 Lexus ES300, To 7/01; Heater Valve
• Fits 1992-2000 Lexus ES300, Heater Valve
• Fits 1996-1997 Lexus LX450, Heater Valve
• Fits 1991-1997 Toyota Land Cruiser, Heater Valve
• Fits 1990 Toyota Land Cruiser, From 1/90; Heater Valve
• Fits 1993-1996 Toyota Camry, Bracket not included; Heater Valve
• Fits 1992 Toyota Camry, w/o Bracket; From 9/91; Heater Valve

Quality Assurance

Four Seasons 74780 is an OE replacement heater valve built for direct-fit HVAC service in supported applications. Its cable-operated, non-bypass design and application-specific dimensions help match original equipment requirements for proper heater control.