Hey Scotty, I have a 2004 Corolla that has a weird mildew type smell when I run the defroster. I've already changed the cabin air filter twice. The most recent time I installed a filter with activated carbon, but the smell is still there. I don't smell it when just the heat is on. It only smells when the front defogger is on. Is there something I can spray down in there to get rid of that smell? Thanks

Comments (2)
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dil 89
dil 89

Yes you have a growth on the evaporator probably from driving with max air on all the time

Jackofall
Jackofall

Make sure the ax drain discharge tube is not plugged. Clean incoming air near wipers. There may be growth on interior radiator in ac system. They make a spray to kill mildew,