New Member from Kalamazoo, Michigan, and have a question

First off, hello from sunny Kalamazoo, MI.

I just purchased a 2015 Sportsman 570 with 430 miles(no eps), and sold my smoking 2002 Sportsman 500HO (7,400 miles hard miles ). I really love the new 570, but have not had the chance to ride much, yet. I have putted around the yard some and have never had the fan kick on. I am not sure if my cooling fan is working ( the overheating light has not come on). Probably just being paranoid. I have heard of some 570 with fan issues. My questions is. How long before my cooling fan should kick on at idle on a 75 degree day? I have let mine idle for 4-5 min with noting. My 500HO would run the fan just after a couple of min.
Thoughts?