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Sounds like you have the begining of a bad second gear syncro. I would have the oil changed in the transmission and check it for metal shavings. Use synthetic oil and that should help preserve the syncros. The bad cold air smell is usually one of two things. Mold on the evaporator which can be cleaned with a mild mixture of bleach and water or else some small critter decided to curl up in the hvac ducts and expired. Pretty common problem in the wintertime. Try changing the pollen filter first as it may just be that. If not, the only solution is to open the dash to clean the evaporator. There are products that will prevent the problem over the long term. They do take special techniques to apply and are generally available only to service professionals. One such product is called Clean 'N Coat. It is a two-part chemical that embeds an antibacterial in an acrylic coating that sticks to the evaporator. It comes in a spray can that you can spray on the evaporator and offers protection for about three years.
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