I have the opposite problem. If I close them tightly for too long, like over the winter, then I have a hard time cranking them open in the spring. The plastic sticks to the seal.
Perhaps the factory has changed to a different brand of vent since my 2005, which only has the single vent plus the single powered vent. Newer models have a double vent plus the powered vent.
I once left both vents fully opened and drove down the freeway for an hour before I saw them in the rear view mirror. I stopped to pop open and close them. No damage occurred.
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