M-Class (W166) Produced 2012-2015

Ml500 issues

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Old Aug 20, 2019 | 11:22 PM
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Zoenation87's Avatar
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06 Mercedes benz Ml500
Ml500 issues

Hello guys i have a 06 ml500 I’m having issues with. Recently my vehicle started forcing radiator fluid out the hose. Its lime it cannot hold the fluid in the line. I took the hose off and checked it, not dry rotted or anything. I put on the obd scanner and got a p0121 after some research I figured it was the tps. I really need some help it’s beginning to get pricey buying fluid every 3rd day. And for now its me and my family of 4 only transportation.
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Old Aug 21, 2019 | 03:48 PM
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2012 X6 35i Sport, 2013 ML 350 BT, 2019 4Runner TRD Pro, 2020 CRV-AWD
Which hose? I'm guessing the overflow from the expansion tank...
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Old Aug 21, 2019 | 04:16 PM
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06 Mercedes benz Ml500
This hose

It connects directly to the radiator

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Old Aug 21, 2019 | 04:25 PM
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Sounds like you're over-pressure. Which is weird. Do you get a high-temp warning or does your gauge show higher than normal temps?
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Old Aug 21, 2019 | 04:30 PM
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No thats the weird part its not over heating or giving any warning i ran my icarsoft obd scanner on it and got a couple of codes but nothing as far as the coolant system. I was thinking could it be because i beed a new pedal position sensor, thats causing this. Or could it just need a new hose
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Old Aug 21, 2019 | 06:04 PM
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2002 Ml320, 2012 ML350 & Slk55
Are you sure there isn't a small crack in the radiator tank just above where the hose couples.

Looking at the photo you supplied there is a sharp line of blue just above the hose.

If it leaks there under pressure it will blow back in the slipstream and cover the hose as shown.

If it were mine I wouldn't be driving it until I'd sorted it as an engine rebuild or blown head gasket/s isn't something I would enjoy.
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Old Aug 21, 2019 | 08:16 PM
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Its coming from the upper hose that connects to the radiator. It seems as if its dripping from where the hose meets the radiator,and the fan is blowing it
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Old Aug 21, 2019 | 09:30 PM
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Here is a good test. Helps find hidden leaks.

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Old Aug 21, 2019 | 11:05 PM
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Thanks I know where the leak is located. What im trying to figure out is why. Let me show you a picture its the upper radiator hose,where it connects to the radiator
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Old Aug 22, 2019 | 01:02 AM
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Originally Posted by Zoenation87
Thanks I know where the leak is located. What im trying to figure out is why. Let me show you a picture its the upper radiator hose,where it connects to the radiator
With all respect, this picture shows the result of the leak, fan blow over it, its dry.
I would start from finding exact place or just replace the tube and be done with it.

P.S. im not a mechanic just trying to help.
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Old Aug 22, 2019 | 01:24 AM
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No, thank you I really appreciate the advice I’ve located the leak,and will be buying a new hose Friday.
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Old Aug 22, 2019 | 09:13 AM
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Originally Posted by Zoenation87
No, thank you I really appreciate the advice I’ve located the leak,and will be buying a new hose Friday.
As an idea, if hose is leaking potentially coolant expansion tank cup might not release pressure.
And test above will tell if cup is doing the work or not.
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Old Aug 22, 2019 | 11:01 AM
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Im definitely heading to my local Autozone to see if i can rent the tool
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