The foam gasket around the plastic lid will sometimes "stick to the vent flange" and prevent it from opening. When one of mine does that, rather than "stress and possibly break" the linkage, I remove the screen and push up on the dome while turning the handle. Then I use some "rubber conditioner" to coat the foam as well as use a paper towel wetted with some alcohol to clean the vent flange. That usually helps prevent it from sticking for a few weeks.
I would not suggest "strong arming the vent open"... That's a sure way to have to buy a new handle and/or new linkage.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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