Main culprit for this is oil from the Evaporator. This along with condensation through time breakes down the foam. Most A4s i do Evaps on now i strip it all off and stick new 3M foam to the blend door. There is a disadvantage along with the crap flying out of the vents. Remember it is a blend door, so if you have foam breaking down you will also have heat blend. Drops the cooling efficiency in the cabin. Gives the same impression as a stuck heater valve.
Jmac
Alba European
Service, Diagnostics and repairs. Mobile Diag available on request
Audi/VW/Porsche Factory trained tech 25+ yrs exp
For people who value experience call 0423965341
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