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My 2013 G63 has been experiencing coolant loss. I topped it off and its been barely a week and the message it back and this time I can see smoke from coolant hitting hot surfaces while driving.
The car doesn't overheat and I can drive like normal and its fine. I noticed it doesn't spill past a certain point in the tank. I see streaks from the cap which leads me to believe when the coolant is hot and boiling it spurts from the cap. Is this indicative that the cap not holding pressure? Time for new cap? Or change whole tank?
I can see the cap failing too but likely its the tank itself or connections to the tank.
Next time its had its fill of coolant and engine at operating temp, switch the engine off and see where its coming from. Likely its the neck of the tank or the hoses leading up to it.
I changed the coolant cap but after a few days it dropped again and the message came back on. I topped it off again and after a few days same thing happened. The thing is I have driven it like this for over a year with the message on and no issues. Which means the coolant is only leaking to a certain point just below Max line. Don't want to buy any other unnecessary parts So I am trying to narrow down the culprit by way of logic.
Here are my thoughts:
-Given they are at the bottom of the tank,If it were any of the hoses, it would continue to leak till empty and overheat.
-If it were the cap, the new cap I got from the local MB dealership should have solved that.
Which leaves me with the tank itself as the culprit.
Makes sense?
I changed the resevoir just recently. $350 cost including parts and labor. Ordered part online and had a indy shop install. I heard its the most common thing on G's that needs replacement every 30-40k miles. Goodluck!
The reservoir on mine has some coolant residue on it too. Hard to tell where the leak is coming from. I picked up a new one and a new cap, hopefully it'll fix the issue
Made a quick video on replacing the expansion tank for those interested.
Part number for the new tank is 204-500-09-49. New cap part number is 210-501-06-15-64
Likewise, I have had trouble with leaking coolant. MB Aust replaced the coolant expansion tank but to no avail. I think I have found the source of the leak but I have no idea of the function of this piece of the car. It looks like a piece of copper pipe that has been crimped and exits under the car near the transfer box. I have attempted to take a photo but it is not super clear. I would be grateful is anybody know what this part is and if the issue can be solved by 're-crimping' the end of this outlet. Crimped pipe is in the middle of the photo which has a constant drip
Likewise, I have had trouble with leaking coolant. MB Aust replaced the coolant expansion tank but to no avail. I think I have found the source of the leak but I have no idea of the function of this piece of the car. It looks like a piece of copper pipe that has been crimped and exits under the car near the transfer box. I have attempted to take a photo but it is not super clear. I would be grateful is anybody know what this part is and if the issue can be solved by 're-crimping' the end of this outlet. Crimped pipe is in the middle of the photo which has a constant drip
can you take a broader pic and circle the leaking piece. I have no idea what it is just looking at it in your pic.
On mine, it actually ended up being the "vent line" as Mercedes calls it that was leaking. Wasn't the actual expansion tank. Easiest way to check is when your truck is hot, pop the hood and wiggle the small coolant line that goes into the front of the tank. You may hear some coolant/steam escaping.
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