Crew cab dust problem

[Rubble]

This is the first crew I have owned,had lots of reg cabs over the years.My problem is when driving down a dirt or gravel road,there is quite a bit of dust coming into the cab,it's worse if I have my window down.This crew has a/c but nothing works anymore and I even plugged the vent on passenger side. I know on my wife's jeep patriot,and our old explorer they were really bad letting dust in if window was open.Just wondering if anyone else has run across this problem too?? I have tried running the heater a/c fan as well,but don't seem to help. I have put lots of weatherstripping on the door seals & no luck..Any of my other trucks have never been an issue with dust this bad.
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