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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
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Coolant leak through weep hole
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Play at water pump pulley shaft indicating a bad bearing
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Squeaking noise coming from the pump at idle
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Overheating conditions
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Low coolant light on instrument cluster indicating a cooling system leak
Parts & Accessories
Coolant: Genuine Mercedes Q1030004
Antifreeze/water=50/50, up to -37°C
Antifreeze/water=55/45, up to -45°C
Tools
3 Ton Professional Grade Floor Jack
Jack Stands 3 Ton
Low Profile Ratchet 1/4"
Teardrop Ratchet 1/4“, 3/8”, 1/2"
Extension Bar 1/4"
Impact Extension Bar 1/2"
Socket Set 1/4" Metric
Impact Socket Set 1/2"
Torx Bit Socket T27
Extension Bar 3/8"
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.