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Originally Posted by DawgBone
Mine doesn't do that. Yours sounds like a gun shot. Mine just has a hissing sound about 5 minutes after shutting her down as well as when you open the door to get in and drive. Which probably is normal, as the Merc GL does the same.
In no way is that normal. IMO
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Should I appeal to BMWNA?
I, too, hear some kind of hissing sound when I open the doors but when I asked a sub service rep, she told me it was just the warm-up internal checks. So I left that question alone.