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  1. #1
    New Member
    Join Date
    Jun 2011
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    Default 08 C6 A/C has musty smell

    I have an 08 C6 that is driven daily. There is a musty smell coming out of the vents when the A/C is on. I have had it to the dealership 3 times for this problem. They have sprayed the microb killing chemical through the system. I have also had them add the blower module so the fan will continue to blow after shutting the engine off. The smell is still there. The last time it was at the dealer for this was last month and the smell is back. I also just changed the cabin filter. Is there any other options or suggestions on curing this problem. Covering it up with deoderizers doesn't work and its a powerful smell that is difficult to ignore. Thanks

  2. #2
    Join Date
    Jul 2008
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    Same thing with mine. Would be interested in knowing how to remedy this.

  3. #3
    Technical Advisor c4c5specialist's Avatar
    Join Date
    May 2001
    New Haven, Ct. USA
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    HI there,

    The afterblow function is programmed into the HVAC control head, there isnt another module installed so be aware that you can turn it on or off by a programming feature.

    Second, I would be looking for ANY blockage at the AC drain.

    Usually, I recommend that they turn off the AC 2 mins prior to shut down, this will also give the evaporator time to drain off the moisture.

    Althebest, c4c5
    GM World Class Certified Technician.
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