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Hissing Noise From Dash Of Mondeo


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#1 Astonm

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Posted 19 May 2011 - 05:52 PM

Hi chaps, just purchased an 2008 Mondeo 2.0tdci Titanium X. Its a great car but I have notice a quite loud hissing / Vacuum noise from the drivers side of the dash. Its not a high pitch hiss and its continuous until you stop (no volume changes)I think I can faintly hear it at a stand still

I turned off the all ventilation (opened and Closed vents) but no change, turned off the radio also.

Any ideas what this could be? Thanks in advance

astonm

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#2 Mondeoman

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Posted 19 May 2011 - 09:23 PM

Could it be the air con pipes ?

#3 Astonm

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Posted 20 May 2011 - 11:56 AM

Could it be the air con pipes ?


Could be but I did have it turned off, the other way I thought of it is that it could be mixed up with a Vacuum noise?? Maybe that would change the diagnosis?

#4 Astonm

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Posted 26 May 2011 - 09:03 PM

UPDATE: Well the hissing / vacuum noise is coming from behind the drivers side of the dash. It is a constant noise UNTIL that is you put your foot on the break!!!! When stationary you can hear the noise put your foot on break it goes completly.

Any ideas??

#5 mintalkin

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Posted 27 May 2011 - 11:32 AM

sounds like a seal on the brake servo has worn allowing air to bypass

#6 Astonm

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Posted 27 May 2011 - 04:40 PM

Is that a big job?

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