So I’m checking the routing of the hoses. And I think they are on backwards the top hose coming out of the firewall from the heater core should go to the radiator and the bottom hose coming out of the firewall should go to the engine, correct? Mine are the opposite.
1981 C10
Any know the diameter of the duct (behind glove box) that goes to the passenger side vent? #20 in photo. Mine is completely gone. Back order on LMC. New to forum. Got truck end last summer.