Genuine OEM 2308300084 - HVAC Heater Control Valve

Product Overview

This Genuine OEM 2308300084 HVAC heater control valve is the factory-original component for Mercedes-Benz climate control systems. It regulates coolant flow to the heating core, managing cabin temperature across a wide range of luxury and performance models. The valve fits R230 SL-Class roadsters (2003–2009), R231 SL-Class roadsters (2009–2012), W221 S-Class sedans (2007–2013), and W222 S-Class sedans (2014–2021), including Maybach variants. As a Genuine OEM part, it meets Mercedes-Benz factory specifications and carries the assurance of dealership-quality replacement.

Symptoms of a Failing HVAC Heater Control Valve

• Insufficient heat output even when climate control is set to maximum temperature
• Coolant leaking from the valve housing or connection points
• Inconsistent cabin temperature that does not respond to thermostat adjustments
• Cold spots in the cabin despite heating mode activation
• Sweet-smelling coolant odor inside the vehicle (sign of internal or external leakage)

Cross Reference Numbers

This Genuine OEM 2308300084 is equivalent to or replaces the following part numbers: 230-830-00-84, 2308300084.

Vehicle Compatibility

This part fits the popular models below. For Fitment Confidence, please use the vehicle selector tool above to verify exact compatibility for your vehicle.

• Mercedes-Benz SL500 5.0 V8 (R230): 2003–2006
• Mercedes-Benz SL55 AMG 5.5 V8 (R230): 2003–2008
• Mercedes-Benz SL600 5.5 V12 (R230): 2004–2008
• Mercedes-Benz SL65 AMG 6.0 V12 (R230): 2005–2009
• Mercedes-Benz SLR McLaren 5.5 V8 (R230): 2005–2009
• Mercedes-Benz SL550 5.5 V8 (R230): 2007–2009
• Mercedes-Benz SL550 5.5 V8 (R231): 2009–2012
• Mercedes-Benz SL63 AMG 6.3 V8 (R231): 2009–2012
• Mercedes-Benz SL65 AMG 6.0 V12 (R231): 2009–2012
• Mercedes-Benz S350 3.0 V6 Diesel (W221): 2012–2013
• Mercedes-Benz S550 4.7 V8 (W222): 2014–2015
• Mercedes-Benz S600 6.0 V12 (W222): 2015–2017
• Mercedes-Benz S63 AMG 5.5 V8 (W222): 2014–2017
• Mercedes-Benz S65 AMG 6.0 V12 (W222): 2015–2020
• Mercedes-Benz Maybach S600 6.0 V12 (W222): 2016–2020
• Mercedes-Benz S560 4.0 V8 (W222): 2018–2021
• Mercedes-Benz Maybach S560 4.0 V8 (W222): 2018–2020
• Mercedes-Benz S450 3.0 V6 (W222): 2018–2020
• Mercedes-Benz S560e 3.0 V6 PHEV (W222): 2019–2020

This may also fit other applications. Please use the vehicle selector tool to verify fitment.

Often Replaced Together

For a complete climate control service, many owners replace the following at the same time:

• Heater hoses and clamps (inspect for cracks or leaks during valve replacement)
• Coolant (flush and refill to factory specification)
• Thermostat and housing (common wear items on older models)
• HVAC blend door actuator (may fail concurrently with valve issues)

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Frequently Asked Questions

How do I know if my Mercedes-Benz SL-Class or S-Class heater control valve needs replacement?

Common signs include weak or no heat output when the climate control is set to maximum temperature, coolant leaking from the valve area, or inconsistent cabin temperatures that do not respond to thermostat adjustments. You may also notice a sweet-smelling coolant odor inside the cabin. If the valve is stuck open, the cabin will remain cold; if stuck closed, coolant may back up and cause overheating or leaks elsewhere in the system.

Is this a Genuine OEM part, and why does that matter?

Yes, this is a Genuine OEM Mercedes-Benz part, manufactured to factory specifications and tolerances. OEM parts ensure precise fitment, proper function, and long-term reliability. Genuine components also carry the confidence of dealership-quality replacement and are often backed by manufacturer warranty coverage when installed by a professional technician.

Do I need any special tools to install this heater control valve?

Installation requires basic hand tools, a floor jack, jack stands, and a drain pan for coolant. You will need to access the valve from under the vehicle or through the engine bay, depending on your specific model. Refer to your factory service manual for exact access points and procedure. The job typically involves disconnecting hoses, unbolting the valve, and refilling the cooling system to proper level and specification.

Will I need to refill my coolant system after replacing the valve?

Yes. Disconnecting the heater valve will drain some coolant from the system. You should flush and refill the entire cooling system with the correct coolant type and concentration specified in your owner's manual. Proper coolant level and type are critical to prevent corrosion, overheating, and future failures.

Does this valve fit both R230 and R231 SL-Class models?

This part is compatible with R230 SL-Class roadsters (2003–2009) and R231 SL-Class roadsters (2009–2012). However, always verify fitment using the vehicle selector tool before purchase, as some model years or trim levels may use slightly different valve designs or configurations.

What is the difference between a heater control valve and a thermostat?

The heater control valve regulates coolant flow specifically to the cabin heating core, allowing you to control cabin temperature independently. The thermostat manages overall engine coolant temperature circulation. Both can fail independently, though symptoms may overlap. If your heating is weak but the engine is at normal operating temperature, the heater valve is the likely culprit.

Order Genuine OEM 2308300084 today to restore reliable climate control to your Mercedes-Benz SL or S-Class. In-stock orders ship same or next business day from our U.S. warehouse, and our fitment team is one call away if you need help confirming the right part for your vehicle.

Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.