Originally Posted by FlashGorden
Would this account for the strange smell that comes through when I turn on the AC in the summer after the car has sat for awhile? Or would that be an issue regarding the fan?
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That's usually mildew growing in the system. Bringing in a bunch of dirt, leaves, etc doesn't help. The biggest problem is water that condenses on the AC evaporator. The evaporator is treated to be anti-microbial, but mildew will still grow in the system. You want to make sure the AC drain is clear. Dirt can build up and clog the drain. Also, you might want to start turning the AC off a few minutes before you get home, but leave the fan on. That will help dry it out, too.
This is such a common problem that there is a product made to solve it. It is a spray called Frigifresh. To use it, you need to be able to get at the evaporator. Most shops that do it drill a hole near the evaporator and spray it in, then plug the hole.
Using a cabin filter will help prevent dirt and organic matter from building up in there... so it will be beneficial to you.