Four Seasons 74898 HVAC Heater Control Valve

OE Heater Valve for Audi HVAC Control

Four Seasons 74898 is an OE replacement HVAC heater control valve for select Audi applications. It uses an electric valve design with a solenoid and auxiliary coolant pump electronic control, helping regulate heater core coolant flow in vehicles that rely on electronic temperature management.

Compatible with 2005-2011 Audi A6, 2005-2011 Audi A6 Quattro, and 2007-2011 Audi S6, this Four Seasons Heater Valve line part is built with thermoplastic and steel construction and uses three hose connectors, three terminals, and a non-bypass layout.

Key Features

• Four Seasons Heater Valve, part number 74898
• OE replacement heater control valve for factory-style fitment
• Electric valve operation with solenoid control
• Non-bypass design with three ports and three hose connectors
• 3 female terminals for electronic connection
• 0.625 in. end openings on both sides
• Thermoplastic / steel construction
• Mounting hardware not included

Product Details

Four Seasons 74898 is part of the Heater Valve product line and is engineered for HVAC temperature control systems that use an electronically operated coolant valve. The valve manages coolant flow to the heater core, supporting cabin heat regulation in Audi A6, Audi A6 Quattro, and Audi S6 models listed below. If you are replacing a leaking, sticking, or electrically unresponsive heater valve, this OE-style component restores the original control strategy used by the vehicle’s heating system. Cross-reference part numbers include Gates EHV105 and URO 4F1959617B for the same application.

Vehicle Fitment

• Fits 2005-2011 Audi A6, N/A, Heater Valve
• Fits 2005-2011 Audi A6 Quattro, N/A, Heater Valve
• Fits 2007-2011 Audi S6, N/A, Heater Valve

Common Replacement Reasons

• No cabin heat or inconsistent heater output
• Coolant flow control issues in the HVAC system
• Leaking heater valve housing or fittings
• Electrical failure at the valve terminals
• Temperature control that does not respond correctly

Installation Notes

Verify connector style, hose size, and port layout before installation. This valve uses three female terminals and 0.625 in. hose connections, so matching the original routing is important for proper operation. Inspect the surrounding coolant hoses and electrical connector condition during replacement, and transfer any reusable components as needed since mounting hardware is not included.

Quality Assurance

Four Seasons supplies HVAC temperature control components for OE-style replacement applications. Part number 74898 is built to match the original heater valve configuration used on the listed Audi models.