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There is no filter on a '93. I would venture to say however that there is mold growing in there. Reach down as far as you can with a brush (like toilet bowl cleaning brush) and clean as much as you can. Spray lysol in there and clean some more. Now run your fan at full blast. Keep doing it until you see some improvement. The cabin filter was later added on S/V 70's from '98 on. A great improvement that also prolongs the life of the evaporator. You can get a rhetrofit kit for about $30 from http://www.fcpgroton.com Well worth it after the cleaning.