My Balboa is on a 1971 Dodge 1 ton van. Over the years someone removed the air conditioner in the cab and must have altered the interior heat ducts. Now when I drive in hot weather the heat coming from the driver dash area is enough to cause third degree burns on my legs. Does any one know how about the lay out of the interior heat ducts in a van this old? It also appears that the lines to the in dash controls have been switched. Any ideas?