A dirty cabin filter can cause cabin fever.......

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One thing that I have found to be a wonderful investment is buying a 'shadetree manual' for your vehicle. It's a book with valuable info about your car, the maintanence schedules and how you can keep your car running.

That will help you see what fixes you can do yourself and what you can't do - like changing cabin filters?

Clymer's and Chilton publish the manuals and you can get them online or at an autoparts store.

The are worth the investment....