Anything dropped down the vent, like maple seeds, leaves, twigs, etc. could get into the blade and seals of the blade valve. A hair dryer can help soften the caulk, then a plastic scraper can help shave it down until you get the rusted metal off, which probably could stain the roof or sides. Replace it with an all plastic vent cover.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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