I have found that the smaller vent covers will also do that over time. Of course our Monty is older. I’ve had the same problem on the smaller vents and had to change them. I try and keep a check on them now each year now. The sun is really hard on them.
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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