My Coleman Mach is the same way. Low fan, low fan, high fan, low cool, high cool. Most likely Coleman had a bunch of 5 position switches and just used them to get rid of them. Probably thought those stupid campers will never know the difference.
We sure showed them didn't we??
I also thought that maybe one of the fan settings was for a unit that might have an electric heating element in it. My manual doesn't really explain it.
Disclaimer: I know that none of us are stupid. Please take no offense as none was intended. Sarcasm on the other hand was intended.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.