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Tapping Noise from Ventilation System 2003 S40 S40-V40

posted by  mdoneday on  Mon Sep 29 12:39 CST 2008
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last visit: Tue Sep 30 07:39 CST 2008
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Hello, I am new to the board, and just started having a problem with my 2003 Volvo S40. Last week while running the A/C I began hearing a tapping noise that lasted about 10 seconds, quiet, 10 seconds of tapping, quiet (few minutes). I have taken the fan off below the dash, and while looking up into the vent system and manipulating the A/C controls. I have found that when the system is set to recirculate air, and block vents from outside-> The tapping begins. It appears to coincide with the closure of the "barriers" that swing down to block off different air ducts. You must excuse my lack of auto terminology in explaining this situation. I have made a video of the "barriers" and the noise, video shot from underneath dash looking through area where fan was attached. http://www.youtube.com/watch?v=Kzfxct_N3Oc

Any help would be greatly appreciated. I am just trying to figure out what is causing the noise, and what part/s I would need to fix it.








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    Tapping Noise from Ventilation System 2003 S40 S40-V40

    posted by  KlausC on  Tue Sep 30 10:34 CST 2008
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    last visit: Fri Oct 24 10:15 CST 2014
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    Great video!! The audio is excellent too.

    It sounds like the plastic toothed gear is broken. The recirc dampner is not closing all the way and when the motor is trying to close, it is slipping on the tooth.

    Hard to tell on cost of repair until you get the silly cover out of the way and physically see what the fix requires. Try to "help" the doors close with your fingers and see if that works.

    Klaus
    --
    Just driving a 1998 V70R :)







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