How was the cooling on the trail on the 146?
no issues. it was a fresh groomed trail at -1 degree (f). It ran 99-105 degrees, just like every things else (boost, non slash models). roughly 13 miles of this trail.
Will that be different on a 10 degree spring morning when everything is frozen solid from the 55 degree melt the day before and no fresh snow to be found? Sure, I would expect it to run 120-160 degrees or more even with scratchers down on solid ice. My axys was the same way. Polaris says the temp sensor comes on at 180 and shouldnt worry about temps until that point.
Sadly I dont have any expierence with new cooling system in those type of conditions. Personally I would not hesitate to run the slash (short tunnel, short cooling) on icy trails so long as I had scratchers.