Dirtytoad

unfortunately that is the gasoline powered version. I pulled the cowling under the windshield and it is a solid tray inside with a drain on each side holding the windshield wiper assembly and nothing else. i should have taken a pic while i had it dissassembled

Could be the dumbest question ever BUT where the hell is the intake (to the outside air) for the air conditioner and the heater on a 2003 silverado 2500HD diesel ? Its not under the windshield cowling >