Cabriolet hydraulic pump blew its fluid!
Thread Starter
Newbie
Joined: Apr 2026
Posts: 3
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2011 A207 E350 A207 cabriolet
Cabriolet hydraulic pump blew its fluid!
New member here, original owner of 2011 E350 A207 cabriolet with 51K miles. After 15 years, 1st problem with top- it made much louder than usual whine when opening, then quit altogether.
I used a borescope to look down into the left side of trunk where the hydraulic pump is. Reservoir is empty and there is a nice puddle of hydraulic fluid collected at the bottom of the trunk directly under the pump.
2 questions: I'm assuming there is a bad seal on the pump. Can it be fixed or do I just need a new pump. If I need a new pump, is there a better source than local dealership?
Also, where can I find good directions for removal of the trim that hides the pump ? I have not found AI to be all that useful in this type of situation.
I used a borescope to look down into the left side of trunk where the hydraulic pump is. Reservoir is empty and there is a nice puddle of hydraulic fluid collected at the bottom of the trunk directly under the pump.
2 questions: I'm assuming there is a bad seal on the pump. Can it be fixed or do I just need a new pump. If I need a new pump, is there a better source than local dealership?
Also, where can I find good directions for removal of the trim that hides the pump ? I have not found AI to be all that useful in this type of situation.
Last edited by odessa; Apr 9, 2026 at 10:22 PM. Reason: typo
Junior Member
Joined: Dec 2008
Posts: 55
Likes: 13
From: Florida
12 E350 Cabrio & 19 C300
Here is a thread that may help you with your problem:
https://mbworld.org/forums/e-class-c...-e550-cab.html
As well, this company may also be able to help:
https://tophydraulics.com/117-a207-e-class
Good luck and keep us up to date on your progress...
https://mbworld.org/forums/e-class-c...-e550-cab.html
As well, this company may also be able to help:
https://tophydraulics.com/117-a207-e-class
Good luck and keep us up to date on your progress...
Thread Starter
Newbie
Joined: Apr 2026
Posts: 3
Likes: 0
2011 A207 E350 A207 cabriolet
Update (no good news here)-
I exposed the pump- removed the left side trunk lining and the power amp. Confirmed large puddle of fluid direcly under pump, reservoir with maybe 1/2 inch of fluid in bottom.
I filled the reservoir, and hooked 12 V to the pump, hoping to confirm site of leak before removing pump for replacement.
Abnormal noise- not the typical whine, but a lower pitched grinding sound. No leak anywhere. Reservoir stays level.
I then hooked pump up normally (power supply and solenoid connectors), and pressed the top control button. Nothing.
Dash says Top Operating (so control module is OK and powered), no 12V at pump connector now. A blown fuse or SAM somewhere.
The only other thing I noted wrong is that the wipers/washer are not working. Different fuses, different SAMs (I think). I checked all the relevant fuses- nothing bad there.
AI says look for inline fuses, and other stuff that I don't know where it is.
Any suggestions?
I exposed the pump- removed the left side trunk lining and the power amp. Confirmed large puddle of fluid direcly under pump, reservoir with maybe 1/2 inch of fluid in bottom.
I filled the reservoir, and hooked 12 V to the pump, hoping to confirm site of leak before removing pump for replacement.
Abnormal noise- not the typical whine, but a lower pitched grinding sound. No leak anywhere. Reservoir stays level.
I then hooked pump up normally (power supply and solenoid connectors), and pressed the top control button. Nothing.
Dash says Top Operating (so control module is OK and powered), no 12V at pump connector now. A blown fuse or SAM somewhere.
The only other thing I noted wrong is that the wipers/washer are not working. Different fuses, different SAMs (I think). I checked all the relevant fuses- nothing bad there.
AI says look for inline fuses, and other stuff that I don't know where it is.
Any suggestions?
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