I have one of each of those that you posted on that link Tim. the 6100 is the warm air recirc, and the 3800 is the fresh air heater. I have all the components, just need make sure it all works. No leaky heater core, the thermal regulator works, etc. I know the blower motor works. So...i'll probably keep the fresh air unit. Which begs the question, what color does it get painted? Same as cab, or is it a little different shade of brown? Thanks
