OK, I just shot some pics. Does this look the same as a BX22 or BX23? Are you talking about the plastic shroud?
I could see how this would work to pull air from underneath in the winter time instead of from the cab, but I was hoping to actually push heat into the cab by running the fan backwards (assuming I mount a DC fan). At this point the biggest question is do I have enough room if I were to remove the existing plastic fan blade .....
Does isn't it look like one of the fan blades is broken off from this angle
One thing I forgot to measure is how big the existing fan is in diameter. If you search on eBay for "10" RADIATOR COOLING FAN HIGH PERFORMANCE FLAT BLADE" you can see the type of fan I was looking at. If this proves to be a pain, I may just take you suggestions and pull air from underneath and plumb in a small heater core. I will keep you guys posted.