Here in the 118 degree Mojave Desert, 6.2L NA, 3 speed, armored grill, 190 degree thermostat, 16 psi cap, coolant 50/50, 2200 AGL, ice tea in hand...Fan cycles on at about 220 ish... depending on all the variable ie: Loading, ambient temp, all things working the engine, etc. Give it a minute...