Hissing Sound from under car

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Loperamide
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Hissing Sound from under car

Wed Apr 10, 2019 8:51 am

Hi guys,

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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XP3NNY
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Re: Hissing Sound from under car

Wed Apr 10, 2019 3:38 pm

This is not probably going to help you, but looking at the video it looks like you have oil leak, which might be a good starting point.

Cheers
BMW X5 40D SE // 2010
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Loperamide
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Re: Hissing Sound from under car

Wed Apr 10, 2019 9:29 pm

oil leak has nothing to do with the hissing sound?
Horizon
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Re: Hissing Sound from under car

Wed Apr 10, 2019 9:54 pm

Most common " hissing sound is leaking airbags on the rear suspension
Get some diluted fairy liquid in a spray bottle and douse the rear airbags, this will result in bubbles from the offending item
The E70's seem the worst offender.
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Loperamide
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Re: Hissing Sound from under car

Thu Apr 11, 2019 8:21 am

As seen the video the sound is at the front. Maybe 'hissing' is the wrong term i am using.

Can you not hear the sound in the video? it comes and goes constantly and changes pitch.
mr angry
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Re: Hissing Sound from under car

Thu Apr 11, 2019 9:02 am

I can hear the noise although not clearly. It may be a noisy aux belt tensioner/idler as mine sounded similar.

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