Keep in mind that the temp gauge on the Workhorse is not linear. In fact, it does not move AT ALL from 188-224, but instead stays at the 1/2 way point on the gauge. It rises from 105 to 188, then STAYS AT 1/2 ALL THE WAY TO 224. Then (and only then) the needle starts to rise again. So if you noticed the gauge actually rising above the halfway point, that means that your engine temp was already exceeding 225. If it got to the beginning of the amber area, it was at 260+ degrees!
My fan clutch kicks in (at any speed) when my temp reaches about 208, and will immediately drop the temps to about 204, where the clutch drops back out. I run over Chiraco Grade in SoCal in 100 degree heat pulling 3 PWC and never have seen the gauge go over 1/2.