Four Seasons 74620 HVAC Heater Control Valve

Four Seasons 74620 Heater Valve Overview

The Four Seasons Heater Valve 74620 is an OE replacement HVAC heater control valve for cable-operated heating systems. It uses a non-bypass, open design with two 0.625 in. hose connections to regulate coolant flow through the heater circuit on select Acura, Honda, and Toyota applications.

Compatible with vehicles such as the Honda Civic, Honda CR-V, Acura Integra, and Toyota 4Runner, this Four Seasons 74620 heater valve is built for direct-fit service where the original valve uses cable operation and a plastic housing.

Key Features

• Cable-operated open non-bypass heater valve
• OE replacement design for factory-style service
• Two hose connectors with 0.63 in. inlet and outlet ports
• Plastic construction for HVAC heater circuit use
• Non-bypass style with 15.875 mm opening
• Four Seasons Heater Valve line application for select import vehicles

Detailed Product Description

Four Seasons part number 74620 is an HVAC heater control valve designed to manage coolant flow to the heater core in cable-operated systems. The valve features a non-bypass configuration, meaning it is intended for applications that route flow through the heater circuit without a bypass path. With matching 0.625 in. openings on both sides, it supports direct hose connection on the specified Acura, Honda, and Toyota fitments.

This heater valve is commonly used on 1986-1995 Toyota Pickup, 1989-1995 Toyota 4Runner, 1988-1995 Honda Civic, 1990-2001 Acura Integra, and related applications listed in the fitment data. If you are replacing a worn or sticking HVAC heater control valve on a Honda Prelude, Honda S2000, or Acura Legend, Four Seasons 74620 provides an OE-style service part for the original cable-operated setup.

This part cross-references UAC HV1212C for the same application.

What It Helps Fix

• Heater output stuck on hot or cold
• Coolant flow not responding to cable control
• Leaking heater valve housing or hose connections
• Inconsistent cabin heat on Acura, Honda, and Toyota HVAC systems
• Sticking or seized heater control valve operation

Installation Notes and Tips

Verify the vehicle uses a cable-operated, non-bypass heater valve before ordering. Match the inlet and outlet hose size to the original 0.625 in. openings, and confirm the hose routing and mounting style against the removed part. Mounting hardware is not included, so reuse or source the correct hardware as needed for the vehicle.

For best results, inspect heater hoses, clamps, and coolant condition during replacement. Bleed the cooling system after installation to help restore proper heater performance.

Quality Assurance

Four Seasons 74620 is an OE replacement heater valve built for the listed factory applications and supported by the Four Seasons Heater Valve product line.