Quote:
Originally Posted by Figuarus
I've sealed the cab as best I can, and used foil tape on the plenum to seal any air leaks. my kick panel vents have been removed and sheet metal covers with foil tape have been put in their place. All of my holes in the firewall are taped over, so I'm not getting much draft from the engine bay.
Thoughts?
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You may have plugged too many holes. These aren't flow-through cabs. As the fan tries to push air into the cab, the existing air has to go somewhere. Crack a window and see what happens. I have econo air and 180 thermostat, everything works great with the window down a quarter or half inch.......