Mercedes-Benz
ML350
13

Power Steering Return Hose May Leak at Radiator Cooler Fitting on Mercedes-Benz ML350

Problem Description and Possible Solution

The power steering return hose may leak at the radiator cooler fitting. If the clamp is not properly tightened, the hose can blow off, causing increased steering effort and a mess under the hood.

Problem Data
RepairPal Verified
Average mileage: 95,947 (44,000–155,578)
3 model years affected: 2003, 2004, 2005
13 people reported this problem
Comments
Viewing 1 - 5 of 5 comments
Power steering return line leaking on the radiator side
Hose blew off with no warning. Fluid everywhere. Even though there is a known recall for this issue, I'm not covered.
The hose blew off, dumping fluid everywhere. Luckily, I was stopped and turning into my driveway. I don't want to think about it if this happened when I was cornering at high speed! My service consultant told me that the hose blew, spewing fluid over the belts. The hose and belts need to be replaced, with labor $1000! I asked what would cause a car that is serviced yearly by them and garaged most of the time to do this. His response, we can't xray the hoses and have no way of knowing the integrity on the inside! I am wondering if this is another Mercedes defective part issues that they don't want to deal with?
After talking to other ML350 owners who have had or have the same problem, I am convinced this has to be a design flaw that should have resulted in a recall from Mercedes. The Power Steering Hose coming out of radiator suddenly started to blow off the fitting repeatedly. Tightened the clamp over and over which seemed to only work for a short time. After replacing the clamp and having to tighten it multiple times as well, the hose finally developed a leak mid point between the radiator fitting and where the hose goes through the bracket. Now have to take to the dealer where they will likely tell me I will need a new rack, pump, Reservoir, and probably a new radiator.
This issue should be considered with "Loss of Power Steering Due to Leaking Steering Rack" as they are likely both related to overall issues with the power steering system (which has already had two safety recalls).
I have had consistently recurring issues with power steering fluid leaks despite five different service repairs. This particular issue was identified this last fall.
What does Mercedes-Benz plan to to do about it?