Coolant recovery line/reservoir replacement
Thread Starter
Junior Member
Joined: Mar 2024
Posts: 15
Likes: 0
sl500
Coolant recovery line/reservoir replacement
Hey all, i just recently bought my first Mercedes, a 2008 E350, and am trying to learn to diy more. I just replaced my serpentine belt but in the process leaned on this return line and partially broke the connector on the reservoir. From what i gathered on another thread, if the reservoir is brittle i should probably just replace the whole thing right? The hose still sits in there but doesnt have a good seal so i didnt know if i could use something to re-secure it or just need to get a new reservoir. Also wasnt sure if i should avoid driving it or can maybe put some electrical tape on there to help hold it in place and it would be fine for the moment. I dont know too much about the cooling system or how it’s pressurized so appreciate any input. Thanks!
MBWorld Fanatic!
Joined: Jan 2014
Posts: 3,965
Likes: 1,315
From: Republic of Texas
'99 and '05 E55 AMG
Replace the reservoir. I paid $40 for a new one. The two stickers on mine cost me another $22. ND-photo.nl has a good Youtube video on it.
https://mbworld.org/forums/e-class-w...over-tank.html
Be advised the bleed line part number is for the M113 V8 engine; yours may be different so use the link to the parts catalog and look up your car.
https://mbworld.org/forums/e-class-w...over-tank.html
Be advised the bleed line part number is for the M113 V8 engine; yours may be different so use the link to the parts catalog and look up your car.
MBWorld Fanatic!
Joined: Jun 2014
Posts: 1,085
Likes: 442
From: Melbourne, Australia
2010 ML550 VIN WDC1641722A564750, 2010 B180
I did something similar. The reservoirs don't last forever either and commonly leak at the seals where the 2 halves come together. Depending on other maintenance performed, maybe use it as an excuse to swap out the reservoir, cap, hoses and coolant. FCP Euro and Rock auto have everything you'd need. Worst case is its good maintenance.
Thread Starter
Junior Member
Joined: Mar 2024
Posts: 15
Likes: 0
sl500
Appreciate the input from you both! I got a new reservoir, didn’t order new hoses but will check them as well. This might be a dumb question but I got one of those syringe like fluid extractors, can I reuse the coolant or need to dispose of it and add new fluid? I believe coolant was flushed recently so originally thought it would be fine to put back in. I also saw on a couple comments on the videos I watched mentioning bleeding the system but the video linked just said to run it. Any steps you’d do after adding the fluid back or should be good to run?
Thread Starter
Junior Member
Joined: Mar 2024
Posts: 15
Likes: 0
sl500
thanks! Pulling out the coolant it seems like theres dirt in the reservoir. Not sure how big of a concern that is for the rest of the coolant in the system. It also seems more of a dark green than blue so trying to determine if its the correct coolant or not
