I need to test turning the fan off at apeed to see if it hurts or helps cooling.

Currently it's set up to go as low as 25% after it's turned on, and doesn't turn off. I haven't seen a case in my truck where it would need to turn off, but apparently my truck isn't the best test subject.

The other thing I think I'll add is a 5 or 10 second delay when you first startup to let any heatsoaking go away before the fan turns on.