Mercedes-Benz W221 Auxiliary Water Pump - Used Original Parts
RM 250
Condition: Used (Original)At a Glance
- Mercedes-Benz W221 Auxiliary Water Pump - Used Original Parts
- Part number: A2218350164
- Fits: Mercedes-Benz S-Class W221 · confirm by chassis number before ordering
- Used Original · tested working
- RM 250 · final quote via WhatsApp
- M.S. Motor · Kuala Lumpur, Malaysia · ready stock
Diagnosis and Common Symptoms
A failing auxiliary water pump on the W221 S-Class typically triggers engine cooling system fault codes such as P0480 or manufacturer-specific codes related to the electric coolant pump circuit (auxiliary pump), often accompanied by a dashboard warning "Visit Workshop" or coolant temperature warnings after start-stop cycles. Common symptoms include a rattling or grinding noise from the pump housing on cold start, poor cabin heating performance, engine overheating during idle or after shutdown (heat soak), and auxiliary cooling fan running excessively as the system tries to compensate. On models equipped with V8 or V12 engines, a dead auxiliary pump can also cause turbo cooling issues, leading to reduced turbo longevity due to inadequate post-shutdown circulation. Many owners first notice a subtle whining sound near the firewall before total pump failure occurs.
Introduction
This is a Genuine Used Mercedes-Benz W221 Auxiliary Water Pump, removed from a verified donor vehicle and Tested to confirm correct electrical draw and coolant flow performance before listing. As a used original component, it retains factory-spec impeller design and housing integrity, unlike generic aftermarket alternatives that often fail within months. Every unit undergoes a bench test simulating real operating conditions to check motor function and listen for bearing noise. Buying Genuine Used ensures OEM-level reliability at a fraction of the cost of a brand new dealer part.
Product Details
- Brand: Mercedes-Benz
- Model Compatibility: W221 S-Class (S350, S400, S450, S500, S550, S600, S63 AMG, S65 AMG)
- Part Name: Auxiliary Water Pump (Electric Coolant Pump)
- Condition: Genuine Used (Tested Working)
- Notes: Bench tested for correct amperage draw and consistent coolant flow prior to listing; visual inspection performed on impeller and housing seals for cracks or leaks; original connector and mounting bracket included where applicable.
Frequently Asked Questions
What are the early warning signs of a failing auxiliary water pump on the W221?
Typical signs include a rattling or grinding sound near the firewall on startup, reduced cabin heater output, and the engine running warmer than usual at idle. Some vehicles will log fault codes related to the coolant pump circuit before full failure occurs.
Does the auxiliary water pump on the W221 need coding after replacement?
No coding or programming is required for the auxiliary water pump itself, as it is a mechanical/electrical component controlled directly by the engine or auxiliary cooling module. Simply plug and install; the system will resume normal operation once connected.
How do I confirm this used auxiliary water pump fits my specific W221 engine variant?
Check the part number stamped on the pump housing or connector against your vehicle's original part, as V6, V8, and V12 W221 variants can use different auxiliary pump specifications. We recommend cross-referencing the number with your chassis and engine code before purchase.
Why buy a used Genuine auxiliary water pump instead of a new aftermarket one for the W221?
Genuine used pumps retain the original German-engineered motor and impeller design, which typically outlasts cheaper aftermarket units that often fail within 6-12 months. In Malaysia's climate, a tested Genuine used pump offers a more reliable and cost-effective solution than an unverified reproduction part.
Are there any installation gotchas when replacing the W221 auxiliary water pump?
Ensure the coolant system is properly bled after installation to avoid airlock, as trapped air can mimic pump failure symptoms like poor heating or overheating. Also verify the mounting bracket and rubber isolators are transferred or replaced to prevent vibration noise.
Part price does not include installation. Our workshop can install for you, labour is charged separately and confirmed with you before any work starts.
We cannot diagnose your car over WhatsApp or photos. Not sure this part will solve your problem? Come for a workshop check, diagnosis fee RM180. If you proceed with the repair using our parts, the RM180 is offset into the labour charge. If you decide not to repair, only the RM180 applies.
All parts are tested and guaranteed to work. Whether a part solves your car's problem can only be confirmed by diagnosis.
Shipping: from Kuala Lumpur, West Malaysia ~RM50, East Malaysia ~RM80 (estimate, confirm via WhatsApp). Delivery 1-2 working days in secure anti-static packaging.
Warranty: 30-day exchange for control units, engines, gearboxes and other major parts; 14 days for small parts. Claims require proof of installation by a qualified workshop. No warranty for items opened, modified, or damaged by wrong installation.
Prices vary with stock and part condition. Final price via WhatsApp.
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