Ken,
Had this problem one time...my fix is that when closing the vents I "crank" them shut a bit -- a very little bit -- beyond the initial "closed" position. This puts a bit of tension on the system that, I believe, over-rides the tendency for road vibration to jiggle the vent open. Use care to avoid stripping the screw/nut system on the vent.
Mark
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Mark and Corinne
SF Bay Area
11 Dodge Ram 1500 with Tow Package
or 04 Pilot w/ Tow Package
Prodigy Brake Controller; Husky 800/1200 WDH; McKesh Mirrors
2006 2720SL; A/C; awning; swing hitch; 14" NEXEN Load Range D tires
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