Mercedes-Benz W124 E-Class Water Pump Replacement

Most water pump failures result in coolant pooling beneath the car, but another sign that the pump is going bad is you'll notice that the car tends to overheat at low engine speed, such as sitting at a stoplight. When you accelerate, the engine temperature will drop. Now, this is not always indicative of a water pump, but a good starting point. You may also want to try squeezing the top radiator hose with the engine warmed up and running (use a glove and watch for heat). You should feel pressure build up on the back of the hose and surge once it is released. If you feel no pressure, it's a fair bet that the water pump is failing.
You will need to begin by safely jacking up and supporting the vehicle, draining the coolant and removing the drive belt. Note: loosen the bolts on the power steering pulley before removing the drive belt. Please see our article on these procedures for further assistance.
Note: there will be several pieces and components missing in the photographs that you will not need to remove. These pieces have been removed for photographic purposes only. You only need to remove what is described in each step. All coolant pump bolts should be checked and be replaced as needed.
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Time: 4 hours
Tab: $50 to $80
Tools: 10mm, 13mm, 15mm socket :www.pelicanparts.com/Mercedes..., 6mm Allen :www.pelicanparts.com/Mercedes..., flathead screwdriver :www.pelicanparts.com/Mercedes...
Applicable Models:
Parts Required: New water pump and gasket :www.pelicanparts.com/cgi-bin/...
Hot Tip: Work on a cool engine
Performance Gain: Properly cooled engine
Complementary Modification: Replace your timing belt
Mercedes-Benz 300CE (1990-93)
Mercedes-Benz 300E (1990-93)
Mercedes-Benz 300TE (1989-92)
Mercedes-Benz E320 (1994-95) :www.pelicanparts.com/catalog/...

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This video is made from our technical article.