weird fan prob..well not really a prob

[jokerjustin]

today at the local track i was just messing around getting the hang of the jumps.. after about 20 mins i brang the truck in and notice the fans on.. i quickly temp it and its at 115?
figured it was higher than 150 but the fan stayed on a while so it shot the temp down...
so i take off again for about 3 mins and it comes on again this time as soon as it started i temped it and it was at 125... i really dont mind as its not a big deal but i thought the fans only turn on at 150?