The 2 fans in front of my radiator are not turning on 1998 Ford Windstar

I was told about a therma or therm ? I don"t have a clue. Thank You

Asked by for the 1998 Ford Windstar
Is the engine overheating?
They do not run all the time!!!! Only when needed. Turn A/C on to see if the fans come on then. (Post results.)
Hi Had the car running with air on & still nothing. Thanks Kathy
Engine getting hot?
Hi The engine control or monitor stays the same in the middle.
Easy test: start the engine and let it run in park, this may take 30 min. or more, fan(s) will come on or engine will start to get hot!!! That's IT!