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-   -   Coolant leak - bad reservoir? (https://mbworld.org/forums/w212-amg/750256-coolant-leak-bad-reservoir.html)

Levijean 07-12-2019 12:25 PM

Coolant leak - bad reservoir?
 
I have a slow coolant leak as evidenced by spots on my garage floor. It may be coming from around the tank but its hard to verify. Is the tank or nearby hose or connection a common point of failure?

Levijean 07-12-2019 12:57 PM

Here are some pics. Clearly there is evidence of coolant around the tank, but it is all dried up.


https://cimg0.ibsrv.net/gimg/www.mbw...40e19d2c9e.jpg
https://cimg1.ibsrv.net/gimg/www.mbw...d4790d3634.jpg
https://cimg2.ibsrv.net/gimg/www.mbw...ab774dd8f0.jpg
https://cimg3.ibsrv.net/gimg/www.mbw...a8fdb827c6.jpg

Ed99 07-12-2019 02:30 PM


Originally Posted by Levijean (Post 7801446)
I have a slow coolant leak as evidenced by spots on my garage floor. It may be coming from around the tank but its hard to verify. Is the tank or nearby hose or connection a common point of failure?

My E63s has been running perfect except one hiccup with the coolant leak. I had my reservoir and pipes replaced and it was not covered under warranty which really sucks.

Bring it back to Mercedes to get it checked.

try m3 07-12-2019 07:18 PM

Last year I rested my arm on that hose going to the reservoir by accident and it snapped in half lol.

mdotk 07-12-2019 09:53 PM

I had a bad reservoir on my old ML63

chiromikey 07-12-2019 11:45 PM

It’s a common problem. Mine was replaced under warranty.

nyc_amg 07-13-2019 08:08 AM

I had to do the main radiator hose, popped off while driving and all coolant drained out.

kponti 07-14-2019 11:55 AM

Why is your coolant green BTW? Shouldn't it be blue?

mj_39 07-24-2020 12:03 AM

Does anyone know the part number for the reservoir tank and how hard it is to change out? I have noticed a pin size hole in the tank.

Mhoughland 07-26-2020 12:06 AM

Common to split at the seem
like yours appears to have done. Easy to change

Antigini 07-28-2020 02:01 PM

Same thing here. Though magically my dealer never saw a problem with it until after my warranty expired. 🙄

NoVAe63s 07-28-2020 04:38 PM

While this appears to be a tank leak, mine was leaking around the reservoir cap. You could see dried precipitate around and down the sides of the fill. Wiped it all down, pulled the cap, cleaned the gasket really well and put back. No leaks since.

crazybear 07-29-2020 11:24 AM


Originally Posted by nyc_amg (Post 7802097)
I had to do the main radiator hose, popped off while driving and all coolant drained out.

same here. if the reservoir isnt the issue, I would check that. its fairly easy to spot from under the car.

brutus_tx 07-29-2020 12:20 PM

Video showing a hairline leak in the bottle


Easy enough to fix.... the part is under $100
Pressurizing the system as shown above will help identify the leak.

NoVAe63s 07-30-2020 06:30 PM

Man for $100 I’d try some crazy glue first! Sad, my Toyota’s never had these sorts of issues. WTF Mercedes are you really that desperate to nickel and dime us? You can make a 600hp super motor that lasts over 100k miles but you can’t design a simple plastic reservoir that doesn’t split and leak?? Homer Simpson could design a better one...

Mhoughland 07-30-2020 06:51 PM


Originally Posted by NoVAe63s (Post 8120731)
Man for $100 I’d try some crazy glue first! Sad, my Toyota’s never had these sorts of issues. WTF Mercedes are you really that desperate to nickel and dime us? You can make a 600hp super motor that lasts over 100k miles but you can’t design a simple plastic reservoir that doesn’t split and leak?? Homer Simpson could design a better one...


it’s an expansion tank under constant pressure. Toyota is just overflow

maxusa 07-30-2020 07:56 PM


Originally Posted by NoVAe63s (Post 8120731)
WTF Mercedes are you really that desperate to nickel and dime us? You can make a 600hp super motor that lasts over 100k miles but you can’t design a simple plastic reservoir that doesn’t split and leak?

I agree with the sentiment. I had the same issue with the reservoir failure at 70K miles in M156. The main issue seems to be heat in the engine compartment. The M157 is worse with turbos baking rubber and plastic elements under the hood. Brittle and fragile wiring harness, disintegrating intake ducts, leaky sensors, etc. Some owners open the hood when garaged to mitigate... The successor M177/178 appears better in this respect with the Hot-V design and shielding. Oh well.

wseikow 07-30-2020 08:20 PM

Mine had 2 miniscule pin holes in the side closest to the engine.
MY 2016 , 50000KM.
Replaced under warranty

Percy Mathonsi 12-15-2020 09:41 AM

Coolant leaking
 
I'm driving c63 amg 2008 .Coolant is leaking at the back of the reservoir not on a cap,sometimes when the idling you see coolant under car. What could be the problem?

Mojo20032004 12-15-2020 09:50 AM


Originally Posted by Percy Mathonsi (Post 8225227)
I'm driving c63 amg 2008 .Coolant is leaking at the back of the reservoir not on a cap,sometimes when the idling you see coolant under car. What could be the problem?

These tanks are a molded 2 piece design. So over time the glue and seals loosen up due to age, heat, and pressure causing leaks. Buy a new tank, fill coolant and bleed air.

AngryScotsman 12-15-2020 11:28 AM


Originally Posted by Percy Mathonsi (Post 8225227)
I'm driving c63 amg 2008 .Coolant is leaking at the back of the reservoir not on a cap,sometimes when the idling you see coolant under car. What could be the problem?


Coolant is leaking at the back of the reservoir not on a cap

Coolant is leaking at the back of the reservoir

back of the reservoir

reservoir
You may have answered your own question.

EckFe1 12-15-2020 02:52 PM

Mine was leaking too. Purchased a new cap and tank. MB must have known something about this as the new tank has a different part #. Looks the same as the old one.

FastWgn 12-15-2020 03:48 PM


Originally Posted by maxusa (Post 8120815)
I agree with the sentiment. I had the same issue with the reservoir failure at 70K miles in M156. The main issue seems to be heat in the engine compartment. The M157 is worse with turbos baking rubber and plastic elements under the hood. Brittle and fragile wiring harness, disintegrating intake ducts, leaky sensors, etc. Some owners open the hood when garaged to mitigate... The successor M177/178 appears better in this respect with the Hot-V design and shielding. Oh well.

Oh no - the (German) hot V engines are much, much worse. Anything in the valley is being baked and breaks very easily.
ItalianJoe (who if I recall correctly was working at a dealer) confirmed this. And since all plastic becomes very brittle in there, you break more pieces than you intend when you try to fix the broken part.

And I am part of the hood club, have done that to all my cars for the last 10 years and it does make a difference.

hwright 12-16-2021 08:57 PM

I was trying to fix/replace the coolant overflow hose on my gl450 (2013) and the hose that it plugs into broke!! I cannot find the part number for that hose. Here is a picture (from this post) of the hose circled in blue. Anyone know what part I need to buy?
https://cimg4.ibsrv.net/gimg/www.mbw...e09606c9a8.jpg
What part # is this hose?

AMGfifty5 12-17-2021 01:49 AM

I just replaced it his on my car as well. I have to look for the part number but when replacing be careful when removing the hose. At the end of that hose it is connected to another plastic piece that is easily cracked as well. It would be best to remove it along with hose which is held in place by a torx bolt.



Originally Posted by hwright (Post 8475131)
I was trying to fix/replace the coolant overflow hose on my gl450 (2013) and the hose that it plugs into broke!! I cannot find the part number for that hose. Here is a picture (from this post) of the hose circled in blue. Anyone know what part I need to buy?
https://cimg4.ibsrv.net/gimg/www.mbw...e09606c9a8.jpg
What part # is this hose?



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