I have a Pantera Electronics fan controller in my setup that uses a separate temp sensor to start the fan ramp up. Don't quote me but I think the first fan step starts around 150F.
In my car the first step is reached within 10 minutes of driving and typically never turns off unless ambient temp is 70-80F and I'm cruising around 80MPH.
Maybe it's an Arizona thing, but I'm not convinced the cooling system runs less than 180F unless you are in low ambient climates and have plenty of air flow.