Mercedes-Benz S-Class, CL-Class Auxiliary Water Pump A2218350064 2005-2013

This is the textbook symptom of a failed auxiliary water pump. When stopped at a red light, your engine RPM drops, and the primary mechanical water pump isn't spinning fast enough to push hot coolant all the way into the cabin heater core on its own. The auxiliary pump is supposed to take over and assist this flow. If it's broken, the hot coolant stops flowing, and your vents will blow cold air until you step on the gas again.

Yes. Because you will be disconnecting active coolant hoses, you will lose a significant amount of engine coolant. It is highly recommended to perform a partial or complete coolant flush using the correct Mercedes-Benz specification blue/pink coolant (depending on your year) while replacing this pump. The system must also be properly bled of air pockets after installation.

This specific pump is utilized across a vast majority of the W221 and C216 production run, including the V8, V12, AMG, and Hybrid architectures. However, always verify your exact part number, as vehicles without certain climate control options (like the auxiliary heater code 228) may utilize a different plumbing layout.

Yes, we ship to most countries worldwide.

You can track your order directly through our website by following these steps:

1. Go to the Europarts360 Tracking Page.
2. You will see an option to search by Tracking Number or Order ID.
3. Enter your number in the search bar.
4. Click the "Track" button to view the current status of your shipment.

We offer a 14-day return policy for all unused items in original packaging.

This warranty covers all eligible products purchased through our website for 6 months from the date of purchase.