Genuine OEM 2722000615 - Engine Coolant Thermostat Kit

Product Overview

This Genuine OEM 2722000615 engine coolant thermostat kit is the factory-specification replacement for Mercedes-Benz CLK550, CLS550, and E550 models from 2007 to 2011. The thermostat regulates coolant flow to maintain optimal engine operating temperature, preventing overheating and ensuring efficient performance across W209 (CLK coupe/convertible), C218 (CLS coupe), and W211/W212 (E-Class sedan) platforms. As a Genuine OEM component, this kit meets Mercedes-Benz factory standards and is backed by OEM warranty coverage when installed by a dealership or certified technician.

This thermostat kit is sold as a complete assembly. One kit per vehicle is required.

Symptoms of a Failing Engine Coolant Thermostat

• Engine running hotter than normal; temperature gauge creeping into the red zone.
• Coolant leaking from the thermostat housing or surrounding gaskets.
• Erratic temperature gauge behavior; needle fluctuating between normal and hot.
• Heater blowing cold air even after the engine warms up.
• Check Engine light illuminated; coolant temperature sensor fault codes stored.
• Visible steam or white smoke from under the hood during or after driving.

Cross Reference Numbers

This Genuine OEM 2722000615 thermostat kit is equivalent to or replaces the following part numbers: 272200061500, 272-200-06-15.

Vehicle Compatibility

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

• Mercedes-Benz CLK550 Coupe/Convertible 5.5 V8 Gas (W209): 2007–2009
• Mercedes-Benz CLS550 4-Door Coupe 5.5 V8 Gas (C218): 2007–2011
• Mercedes-Benz E550 Sedan 5.5 V8 Gas (W211): 2007–2009
• Mercedes-Benz E550 4MATIC Sedan 5.5 V8 Gas (W211): 2007–2009

This kit may also fit other applications. Please use the vehicle selector tool to verify compatibility before purchase.

Often Replaced Together

For a complete cooling system service, many owners replace the following at the same time:

• Engine coolant (flush and fill with the correct Mercedes-Benz specification).
• Coolant hoses and clamps if leaking or deteriorated.
• Water pump if the vehicle has high mileage.
• Radiator cap to ensure proper cooling system pressure.

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Frequently Asked Questions

How do I know if my Mercedes-Benz E550 or CLS550 needs a new thermostat?

Common warning signs include an engine that runs hotter than normal, a temperature gauge that fluctuates wildly, coolant leaks from the thermostat housing area, or a heater that blows cold air even after the engine reaches operating temperature. If your check engine light is on and you see a coolant temperature sensor fault code, the thermostat is often the culprit. A professional scan or visual inspection of the thermostat housing can confirm the diagnosis.

What is included in this thermostat kit?

This Genuine OEM kit contains the thermostat assembly and necessary gaskets and seals required for proper installation. All components are factory-matched to ensure correct fitment and performance. Do not reuse old gaskets; always use the new seals provided in the kit to prevent coolant leaks.

Do I need to drain the entire cooling system to replace the thermostat?

Yes, the cooling system must be partially or fully drained depending on the thermostat housing location. Consult your vehicle service manual or a professional technician for the exact procedure. Always allow the engine to cool completely before opening the cooling system, and follow proper coolant disposal procedures. After installation, the system must be refilled with the correct Mercedes-Benz coolant specification and bled of air.

Can I install this thermostat myself, or do I need a professional?

Thermostat replacement is moderately complex and requires basic mechanical knowledge, a floor jack, jack stands, socket set, and coolant drain pan. You will need to access the thermostat housing, remove fasteners, disconnect hoses, and install new gaskets. If you are uncomfortable working with the cooling system, a professional technician can complete the job quickly. Improper installation can lead to coolant leaks and overheating.

Is this a Genuine Mercedes-Benz part?

Yes, this is a Genuine OEM thermostat kit manufactured to Mercedes-Benz factory specifications. It carries the same quality assurance and performance standards as parts sold through a Mercedes-Benz dealership. Using Genuine OEM parts ensures compatibility, reliability, and warranty coverage when serviced by an authorized dealer.

What is the expected lifespan of an engine coolant thermostat?

A properly functioning thermostat typically lasts 80,000 to 100,000 miles or more, depending on driving conditions and coolant maintenance. Regular coolant flushes and using the correct coolant specification help extend thermostat life. Once a thermostat begins to fail, replacement is the only solution; repair is not possible.

Order Genuine OEM 2722000615 today to restore proper cooling system function in your Mercedes-Benz. 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 CLK550, CLS550, or E550.

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.