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Lion Yard Trading
Mercedes-Benz · Cooling

Auxiliary (electric) water pump

A small electric pump that circulates coolant when the engine is not running or not turning fast enough — for the turbo, the heater or the charge cooler.

Also called auxiliary pump, electric coolant pump.

How you know it is this

  • No heat from the heater at idle, which improves when revved
  • A fault code naming an auxiliary coolant pump
  • A turbo running hot after shutdown

Worth knowing before you buy

  • A modern car may have several of these doing different jobs. The fault code names which.
  • They fail silently — nothing overheats, but the turbo loses its cool-down circulation, which shortens its life.
  • Cheap and usually accessible compared with the main pump.

What we need to quote it. The engine code and the fault codes. The chassis number settles the generation, the body and usually the engine in seventeen characters — it is on your mulkiya. A photograph of the old part helps where there is more than one version.

RadiatorExpansion tank and capUpper and lower hosesThermostat and housingWater pumpAuxiliary pumpFan and clutchShroud and mountsHeater matrix and valveHeater hosesPipes and flangesTemperature sensorAuxiliary coolers
Cooling circuit — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the pumps, fans and thermostats

All cooling parts
Get in touch

Auxiliary (electric) water pump for your Mercedes-Benz?

Send the chassis number and a photograph of the old part. We come back with genuine, OEM and aftermarket options priced side by side, with lead times.

Mon–Sat, 8:00 AM – 6:00 PM · +971 54 303 3119 (Operations Director) · +971 54 241 0599 (Managing Director)