Astonm Posted May 19, 2011 Share Posted May 19, 2011 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 Quote Link to comment Share on other sites More sharing options...
Mondeoman Posted May 19, 2011 Share Posted May 19, 2011 Could it be the air con pipes ? Quote Link to comment Share on other sites More sharing options...
Astonm Posted May 20, 2011 Author Share Posted May 20, 2011 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? Quote Link to comment Share on other sites More sharing options...
Astonm Posted May 26, 2011 Author Share Posted May 26, 2011 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?? Quote Link to comment Share on other sites More sharing options...
mintalkin Posted May 27, 2011 Share Posted May 27, 2011 sounds like a seal on the brake servo has worn allowing air to bypass Quote Link to comment Share on other sites More sharing options...
Astonm Posted May 27, 2011 Author Share Posted May 27, 2011 Is that a big job? Quote Link to comment Share on other sites More sharing options...
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