Electrical Meltdown in my GL320
The cause of the leak was probably through the sunroof drain that never got hooked up. However, and interestingly, the first thing to go out was the electronic control on the liftgate, which was among the most wet of the parts that got replaced. It is possible that there was an insidious leak through the liftgate all along that set the whole chain of events off. The dealer is being honest that they cannot say for sure what the cause of the leak was, only that there was a surprising amount of water in compartments that are not seen by the normal person.
They connected the sunroof drain, added a water repelling gasket to the rear hatch area, and fixed the power liftgate. Then they aggressively leak tested the car with a power sprayer, with no ingress of water.
I would have to give the dealer two thumbs up for its handling of this. And I am really glad to have my GL back -- that little C230 was wearing me out!
Here is for a problem free ride from now on.
I'm suprised they didn't offer a nicer loaner especially being that the issue was on MB's end. If it were me I would have made sure I got an E350 loaner if not one of the 25-50 ML350 loaners from my dealer




