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Originally Posted by IronWolf  what I still dont get is when the A/C is on for about 30-40 mins the A/C ducts should be quite dehumidified, however when you switch off the A/C button the foul air hits you almost instantly.
I dont believe that the humidity levels increase so much in those few secs to pick up the fungal smell again. |
The cooling coils pick up moisture from the air. The air does get dehumidified, it's just that the humidity is retained, as water by condensation, on the coils. Since coils are always moist, they provide a good place for fungus and bacteria to grow. This is what gives the bad smell.
The only easy cure is: before shutting off the car after a long drive, put the blower on re-circ. mode, turn the temp control all the way to hot (put compressor off) and let the blower run for five minutes or so. This dries and heats the coils and sterilises the fungus/bacteria.