Defective Water Pump - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 10-30-2011, 01:03 PM Thread Starter
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Date registered: Nov 2003
Vehicle: 2004 CLK320
Location: Toronto
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Defective Water Pump

I drive a 2004 CLK320, today I heard a clicking noise from the car and looking into the engine bay, I saw liquid dripping out of a device in the bottom of the fan belt. After I drove for a while, a malfunction alert came on asking me to check the coolant level. I guess I have a defective water pump.

Is it a big job to replace the water pump? What is the ball-part figure?

In other cars with timing belt, it is recommended to change the timing belt every 100K km. It is recommended to change the water pump at the same time. Since my 2004 CLK320 has a timing chain, I never changed the chain or the water pump. After 200K km, I guess it is time.

I will add some coolant tomorrow before driving it to the dealership. Is there anything else I should change when replacing the water pump?
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post #2 of 3 (permalink) Old 10-30-2011, 05:21 PM
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Vehicle: 500SE AMG, E350 4matic, GL 450
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I believe the engine in your car is the same type in my ML320. I have changed the water pump in mine. There is a DIY write up on it in case you decide to do it yourself or see for yourself what will be done by the mechanic. There is a special tool required. I found it on ebay. Since you are taking it to the dealership, I am sure they will use MB coolant. That would be the only recommendation I would make to anyone who decides to do it themselves. You could also use the equivalent zerex coolant if it is available in your area. The job itself took some time. If I remember correctly a couple of hours. Not exactly a ton of fun! Glad it is something that only needs to be done once in a great while. As to the belt, do you mean the serpentine belt? If so, I did change my belt when I changed the water pump. I had 105K miles when this was done, if I remember correctly.

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post #3 of 3 (permalink) Old 10-30-2011, 05:58 PM Thread Starter
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Not sure what it's called. These belts sit in the front part of the engine, now I known their proper name.
My car is 2004, it's probably a good idea to change these serpentine belts as well. Are these belts expensive?
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