i have a 73 comet 250. ok i have a 160 thermastat. and im getting good heat above the dash (defroster) and under the dash (heat) but the vents in the dash arent giving me any thing. is there a reason or are the for AC if i had it. vehicle has never had AC. thanks for your help.
In a non factory ac car, there are no dash vents. If you have them, either the car was originally factory air, or the dash was changed out sometime.