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RTH! Coolant leak just started!

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Old Jun 27, 2019 | 07:30 PM
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kino1161
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From: Virginia
2008 ML350 4Matic
RTH! Coolant leak just started!
In the pics you will see where the leak is coming from. Anyone experience this leak before? The add coolant message is showing now. What can I do to fix this?

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Old Jun 28, 2019 | 02:34 AM
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2002 ML 320 & 2006 ML500
Either the coolant pump is leaking or the hose & seal is leaking. Do not drive the truck until the coolant level is adjusted.
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Old Jun 28, 2019 | 08:37 AM
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From: Virginia
2008 ML350 4Matic
Thanks, a million, Maj Dundee! I must say that while the truck was running (in the garage), I could see the coolant dripping from the hose/clamp in the second pic. Also, there was a little wetness behind that pulley (that is circled in the first pic). Could that mean that further mean that the coolant pump is the culprit?

Also, is coolant pump and water pump synonymous?

Thanks, for your help.
Last edited by kino1161; Jun 28, 2019 at 08:43 AM.
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Old Jun 28, 2019 | 10:27 AM
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Yes they are synonymous.

The leak can be coming from the pump leaking down on the hose or vice versa.

Your mechanic should have the pressure tester that is attached to the coolant reservoir and it will be able to tell where the leak is coming from.

What color fluid is in your reservoir?
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Old Jun 28, 2019 | 11:11 AM
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Blue and I am doing the replace myself.
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Old Jun 28, 2019 | 12:04 PM
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Originally Posted by kino1161
Blue and I am doing the replace myself.

What are you replacing and do you need instructions?
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Old Jun 28, 2019 | 01:57 PM
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From: Virginia
2008 ML350 4Matic
I will be replacing the water pump. I saw a step by step video on you tube. More instructions wouldn't hurt. Everything helps in one way or another.

While I am there I will also be replacing the belt, belt tensioner pulley, and stationary pulley.
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Old Jun 29, 2019 | 05:28 AM
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Maj. Dundee
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Buy parts from the dealer.
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Old Jun 30, 2019 | 06:10 AM
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Or you can buy all the parts from Gates, very reputable.
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Last edited by Maj. Dundee; Jun 30, 2019 at 06:16 AM.
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