I have an 08 Limited Sequoia with 32,500 mile on it, this is the second time that I am getting a bad smell from the AC. It's like a mildew/ dirty sock smell. Does anybody know what causes it? I have changed the cabin air filter 3 times already. The last time I took it 2 the dealer, they said it was just a dirty cabin air filter. Anybody have the same problem? Any solutions for this problem?