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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.
Step 2 Lift Vehicle
Substep:
2.1 Jack front vehicle at front central jack point;
2.2 Support vehicle at front side jack points with jack stands;
2.3 Jack rear vehicle at rear central jack point, if w/o rear central jack point, jack at the bottom of differential sell which fixed at subframe carrier directly;
2.4 Support vehicle at rear side jack points with jack stands.
Step 3 Remove bottom engine compartment paneling
Substep:
3.1 Remove bolts (4) (8 bolts).
3.2 Remove rear engine compartment paneling (2) Do not lose washers(5) When installing ensure the washer(5) is seated correctly
3.3 Remove bolt (3) (6 bolts).
3.4 Remove front engine compartment paneling (1)
Step 4 Drain Coolant from Radiator
Substep:
4.1 Unscrew cap for coolant expansion reservoir (1) Unscrew cap slowly and relieve excess pressure;
4.2 Slide collector siphon hose onto fitting (6) at the radiator, The fitting (6) is located at the bottom left of the radiator.
4.3 Loosen siphon hose (5) at the radiator and drain the coolant. Observe regulations for disposal of coolant.
Step 5 Disconnect battery ground line
Substep:
5.1 Move the right front seat completely to the rear;
5.2 Switch off all electrical consumers to prevent damage;
5.3 Switch off ignition and remove; On vehicles with Keyless Go, Press the start/stop button repeatedly to switch off. Keep the transmitter key away from the vehicle at least 2 m;
5.4 Using a suitable tool moves into the opening of the rail cover (1) (arrow A) and unclip rail cover (1) and move forward (arrow B);
5.5 Lift up the floor covering (2) upwards (arrow C);
5.6 Remove nut (5) to battery negative pole circuit, detach ground line (6) of battery (G1) Ensure that no jumper start device is connected to the vehicle. 6Nm (53 lb-in) for installation.
Step 6 Drain Coolant from Coolant Pump
Substep:
6.1 Loosen drain screw (7) on the coolant pump (8) until it can be turned by hand, 6Nm (80lb-in) +90° for installation;
6.2 Push drain hose (9) onto the drain screw (7);
6.3 Unfasten drain screw (7) further by hand and drain off coolant.
Step 7 Remove Belt
Substep:
7.1 Remove front engine cover;
7.2 Slacken poly-V belt and remove swivel clamping device (1) at hexagon (4) counterclockwise, remove poly-V belt and de-tension clamping device (1)
7.3 Check belt pulley sections, the tensioning device (1), and the guide pulley (2). Check poly-V belt Check for damage, wear, and dirt; replace if necessary.