Mercedes Sprinter Auxiliary Water Pump – Bosch OEM | #2118350264 (2010–2022)

When your Sprinter's cabin heat becomes inconsistent, slow to warm up, or stops working altogether, the auxiliary water pump is often the first place to look. This electric pump circulates coolant through the heater core independently of the main water pump — and when it fails, your heating system suffers even if the rest of the cooling circuit is functioning perfectly. This Bosch-built OEM replacement restores proper coolant circulation and reliable cabin heat.

What This Part Does

Unlike the main belt-driven water pump, this electric auxiliary pump runs independently to push coolant through the heater core and climate control circuit. It operates whenever the ignition is on, ensuring consistent coolant flow to the HVAC system regardless of engine speed. A failed pump means reduced or no cabin heat, poor defrost performance, and in some configurations, increased strain on the climate control system.

When to Replace It

Replace this pump if you're experiencing weak or no cabin heat, slow warm-up times, or fault codes related to the auxiliary coolant circuit. It's also a smart preventive replacement on high-mileage vans — this pump runs continuously and wears over time. Before replacing, flush the coolant system to remove any debris that may have caused the original failure.

Fitment

• 2010–2022 Mercedes-Benz Sprinter 2500 – 2.1L & 3.0L Diesel
• 2010–2022 Mercedes-Benz Sprinter 3500 – 2.1L & 3.0L Diesel

Always verify your VIN before ordering. Contact us and we'll confirm fitment before you buy.

Part Numbers

• Mercedes OEM: 2118350264 / A2118350264
• Bosch: 0 392 023 004
• Cross Reference: 6398350064, 2118350364
• SKU: 2118350264B