I am trying to get ready for a hunting trip and I am having some trouble with my front heater. I have a 1995 Georgie Boy Pursuit with dual furnace / AC controls. The rear heater works fine, but when I fire up the front I can hear the fan come on loud and clear but no air is coming out of the floor vents. I can smell that the heater has kicked on. If I go outside I can feel it blowing quite well and hot out of the exterior vent. Does anyone know if there is a shut off or diverter that would block air from coming out of the vents? I appreciate any input you all can provide.