I let the dealer muck with this one. however, when they wanted to charge me $25 to install the engine air filter...I did it myself, rofl!
$25 ? I was at the dealer yesterday and an old lady came in complaining about foul mildew smell coming from her air vents, the dealer stood there with a straight face and said they can easily fix it by servicing her cabin air filter for a low price of $75, and they would vacuum all the leaves and pollen, yada yada yada, new filter is better for your health HEPA, all BS to sell ...... I wanted to tell her so bad that I can do it for her for free, but she already agreed and thanked the dealer like they were doing her a favor....
unfortuantely for her, I don't think swapping out filter will solve the real issue, need to get to the source of the smell: the mildew on the evap coils.....
https://www.mazdas247.com/forum/showthread.php?123856340-Unclog-a-c-drain-and-remove-musty-smell-easily&highlight=mildew
wonder how much the dealer will charge for this ? $125 ? not sure they even know how to do it.....
they would probably say the whole evap has to be cleaned and need to take apart the whole dash to get to it, $500
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