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Mercedes-Benz

Coolant Pump Replace (M276)

Brand: Mercedes-Benz

Model: R350

Chassis: W251

​Engine: M276 DE35

Transmission: 722.9

Project: Repair

​Labor: 3 hours

Water Pump Location
Water Pump Location

水泵位置

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Water Pump
Water Pump

水泵

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Parts relations
Parts relations

零件关系图

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Water Pump Location
Water Pump Location

水泵位置

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Overview

The vehicle's engine water pump is responsible for keeping coolant flowing through the engine. As water pumps get old the internal bearing can go bad causing noise and a coolant leak. A good indicator that your water pump is failing is if you see coolant leaking through the water pump "weep hole".

Engine Water Pump Failure Symptoms

  • Coolant leak through weep hole

  • Play at water pump pulley shaft indicating a bad bearing

  • Squeaking noise coming from the pump at idle

  • Overheating conditions

  • Low coolant light on instrument cluster indicating a cooling system leak

Remove

Step 1  Open The Engine Hood

Substep

1.1 Pull lever (1) in the left side of the footwell to unlock the engine hood (2) Engine hood jumps open; lift engine hood slightly if necessary

1.2 Raise handle (3) and open engine hood. Windshield wiper arms must not be folded forward;​

1.3 Press the red release button (4) on the gas-operated strut and position the engine hood vertically.

Step 2 Lift Vehicle