The on off thing sucks, but is normal. That's just how the new control box / thermostat works. It decides what speed it wants when in auto, depending on the temp. The older ones had a smooth transition between speeds. First time I dealt with the newer ones on our Forester, I thought something was wrong with it, until I went in several other campers with the same set up. If it's too annoying, just put it on high fan and let it go.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.