Why does the radiator light always come on in a 2001 Ford Escape if the car is not running hot and the fluids are at level?

It may have a bad temperature sensor.

My 01 Escape radiator light comes on intermittently and I can't nail down the precise conditions. 3 different FORD garages have told me the sensor in the coolant reservoir is bad. Bad news is that to replace the sensor you have to replace the whole reservoir; good news is that it only costs ~$75 at Autozone. Since I know that this is the problem I just keep an eye on the fluid level until I get a chance to replace it.