Four Seasons 74002 HVAC Heater Control Valve

Four Seasons 74002 Heater Valve Overview

Four Seasons 74002 is an OE replacement HVAC heater control valve for cable-operated heating systems. It uses a pull-to-close, non-bypass design with two hose connectors and a 0.625 in. opening to regulate coolant flow through the heater circuit.

Compatible with 2004-2007 Acura TSX and 2007-2012 Acura RDX heater valve applications, this part number 74002 is built for direct-fit service in vehicles that use cable operation. Four Seasons Heater Valve line parts are selected for replacement of the original heater control valve in temperature control repairs.

Key Features

• Cable-operated heater control valve
• Pull-to-close, non-bypass style
• OE replacement design
• Plastic construction
• Two hose connectors
• 0.625 in. opening size

Detailed Description

Four Seasons 74002 is an HVAC heater control valve used to manage coolant flow to the heater core. The cable-operated mechanism allows the valve to open and close with the vehicle’s temperature control system, while the non-bypass layout routes flow without a bypass circuit. This makes it a direct replacement choice for Acura TSX and Acura RDX heater valve service where the original valve has worn, stuck, or begun leaking.

This part cross-references Carlson H851 for the same application.

Common Repair Symptoms

• No heat or inconsistent cabin heat
• Heater valve stuck open or stuck closed
• Coolant leakage at the valve body or hose connections
• Temperature control that does not respond correctly
• Restricted coolant flow through the heater circuit

Installation Notes and Tips

Verify cable operation, hose routing, and connector size before installation. Match the valve orientation and opening size to the original unit, and inspect heater hoses for wear, swelling, or coolant residue during replacement. Confirm the vehicle uses a cable-operated, non-bypass heater valve before ordering.

Quality Assurance

Four Seasons 74002 is an OE replacement heater valve built to match the original application requirements for the listed Acura models. It is intended for direct replacement service in HVAC temperature control repairs.