Engine Cooling Fan Conditions

[David N.]

Does anyone know the exact conditions for the engine compartment cooling fan to activate? My car has a tendency to run a little warm (95 degrees Celcius according to engine coolant temp diagnostic), but I took it for a spirited run in the mountains today and it was hitting 105 and I noticed the cooling fan still wasn't turning on (this was driving between 30-60mph). The fan came on going home when I was at 94 degrees on the freeway at 80mph. If it uses the coolant temp as its condition, doesn't seem like it's being very consistent.

If it isn't activating consistently, is there a common sensor problem or something that would be to blame? Thanks guys, I tried searching the forum but wasn't having a lot of luck.

-David

Ocean Blue 2000 S