I have a few questions regarding the hoses behind dash and the heater in my samurai.. I hear that heat only comes out of the bottom 2 vents under radio/ close to the floor? If so what are the round vents for on the dash? I know I don't have air conditioning but was possible an available option from factory? I need some help here guys I can't try either yet because my dash is out and the Sammy is not running yet but I want to make sure that I have a heater when I do fire her up. I drilled a hole and vacumed a bunch of leaves and junk already from the heater unit. Is there anything else I should do to ensure good heater function? Can I use black ducting tape to make a better seal where the hoses connect? Any opinions or tips are greatly appreciated thanks.