i have the original deluxe heater that attaches to the big square hole on passengers inside wall. in order to keep more of the cold air outside and the warm air inside, ive thought about covering up that opening with sheet metal and then puting the heater into place. doing that might keep that exposed side of the heater core covered from that outside, providing more heat to be blown into the cab. am i crazy or has someone else thought about that too? would it even work?
