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#1
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Hissing Sound from under car
Could you tell me what the 'hissing' sound is in the below link. It's coming from under the car. Thanks. https://www.youtube.com/watch?v=CQMqLDocGrs
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2012 X5 xDrive 30d |
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#2
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Really hard to tell anything with that recording but hissing sound could be an exhaust leak in combination with a blocked cat or a vacuum leak, maybe even at the pan gasket since the crankcase is under vacuum and looks like you some oil leaks. Maybe try tracing sound with a piece of rubber hose held to your ear.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#3
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Maybe a bad idler bearing, alternator bearing, etc?
Seems to change pitch a bit like bad bearings.
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Just BMW's - All cars and trucks was two pages long 1994 318is 1997 528i 2000 323i 2001 X5 3.0 auto 2005 X5 3.0 auto 2011 535xi auto 2013 X5 xdrive35 Turbo More are at my website Aftermarket E53 Radio Install |
#4
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Hissing Sound from under car
It sounds also like metal sliding on metal (like a dragging brake shoe). The ac clutch can make that sound. If the ac was turning on and off that would make sense. The sound seemed to be coming and going, if that is accurate it won't be most of those suggestions above.*
Any of the rolling accessories could be generating the sound, so were it me: have somebody turn AC on/off see if the sound changes, if inconclusive, take the serp belt off and see if the sound goes away then you can least discount all the spinning stuff. You said the sound came out the bottom but the hood was closed?? * Crowz replied while I was typing. That "above" suggestion is the same as mine.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) Last edited by andrewwynn; 04-10-2019 at 01:04 PM. |
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