Take command of cabin comfort with the Four Seasons HVAC Heater Control Valve (P/N 74941), a rotary electronic heater valve that regulates the flow of coolant to the heater core so your climate system can deliver the temperature you set. It drops in as a direct-fit replacement across a wide range of Mercedes-Benz models — including the 2012-2013 S350, 2014-2017 S550, 2018-2019 S560, 2015-2019 S65 AMG, 2016-2017 Maybach S600, 2003-2006 SL500, 2007-2012 SL550 and 2005-2009 SLR McLaren — all listed for engine code All. See the Buyer's Guide tab for the full list of 21 applications.
Electronically controlled: an electric valve with rotary bypass operation for precise coolant metering.
Temperature tested to 270°F: validated to handle heater-circuit operating temperatures.
Pressure tested: checked to help ensure a leak-free design.
Application-specific design: built to suit the listed vehicles, with a plastic body and 4 connectors.
Backed by Four Seasons' decades of mobile climate-control experience, this valve is intended to restore proper heater-core coolant control. If a failed heater control valve is the cause of no heat, weak heat, or a coolant leak at the valve, replacing it addresses that fault. Diagnose the cause before replacing. Manufacturer part number 74941.
This part cross-references / interchanges with the following part numbers:
74941, EHV140, 2308300084, 300050, H78030
Frequently Asked Questions
What does the Four Seasons 74941 heater control valve do?
It regulates the flow of engine coolant to the heater core, allowing the climate system to control how much heat reaches the cabin. It is an electronically controlled, rotary bypass-style electric valve.
Which vehicles does this valve fit?
It is a direct-fit replacement for many Mercedes-Benz S-Class, Maybach and SL models (engine code All), such as the S350, S550, S560, S65 AMG, SL500 and SLR McLaren. See the Buyer's Guide tab for all 21 applications.
What are the signs this valve may need replacing?
Signs may include little or no cabin heat, inability to control cabin temperature, or a coolant leak at the valve. These symptoms can have other causes, so diagnose before replacing.
Is this valve electronically controlled?
Yes. Per the manufacturer facts it is an electronically controlled electric valve with a rotary bypass design.
How is this part identified?
It is Four Seasons manufacturer part number 74941, an HVAC Heater Control Valve with a plastic body and 4 connectors.
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WARNING:
These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov.
