Check your cabin filter. If that doesn't do it, you may have some standing water in there somewhere. Ford's are notorious for that.
The filter is pretty easy to replace. It's under the plastic cowl between the engine bay and the windshield. Cabin air filter part # is 4R3Z19N619AA.alrighty thanks for the tip thats what i assumed but i just wanted to get some advice before i went and started doing stuff just off my own hunch
I think I see the problem:That's crazy, it's completely opposite of mine. Mine only smells when I turn ON the A/c and not when it's off.
I believe the mold/mildew would more likely be upstream from where the air gets heated. Drying out the parts where the growths are may help, but it doesn't necessarily kill or eliminate them. Molds are very tenacious beings. Many times they'll come to life with a little moisture, even after having been dry for quite a while.Just mold/mildew with the AC unit. Would turning the heater on full blast dry out any water and kill whatever causing the smell?