majorchamp

So been searching far and wide. Kind of cracked part of the cap...it isn't exposing anything inside the reservoir but I'd like to just replace the cap now.

I can find the cap for all types of vehicles...but I cannot for the GL450 (2011). Is this a part that is common on other models of Mercedes and would work on the GL450...but online databases simply view it as 'not a match'?

If so...what other model could I select that would make it a match? I don't want to replace the entire reservoir for a cap...

Max Blast

$70 for a new reservoir, use that cap.
Depending on how old your reservoir is it's time to change it anyway - there is a filter in there that clogs over time.

Or find a cap in a junkyard. Common to a lot of MB from the 00s.

eric_in_sd

Agreed. Changing the reservoir is not a very difficult service. Just make sure you use a new D-ring, and make sure you install at the right point.

Not to inflict a cascading series of repairs, but it would not be a bad idea to replace the pump and low pressure hoses at the same time if they are aged.

lkchris

Also, verify you don't have a leak at the oil cooler-to filter canister interface ... just a new gasket required. This leak is common and you have to take the power steering reservoir off to fix it. There is a power steering bleeding procedure to perform when replacing the reservoir which you can likely find by searching X164 or W164 forums.

texas008

The PS reservoir is on sale for $20 at FCP euro now.