M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Constant/regular loud air blow off from passenger rear (not normal exit hissing)

Old Apr 30, 2022 | 09:02 AM
  #1  
Ml63highmiles's Avatar
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2008 ML63 AMG
Constant/regular loud air blow off from passenger rear (not normal exit hissing)

I recorded a video of it here:

It's definitely not the normal hissing and it occurs constantly/under all conditions (parked/at idle, when driving, etc). I did have it parked all winter in raised mode (to get it over snow hump next to garage) and hoping I didn't do any damage!
Anyone have any ideas?
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Old May 1, 2022 | 04:01 AM
  #2  
Maj. Dundee's Avatar
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From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
The only thing it could is there is a leakage Airmatic system. You must check for codes in the Airmatic system with a scanner, code reader will not do.
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DTC Airmatic 156 AMG..pdf (74.4 KB, 100 views)
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