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They are mounted up front of the radiator. They come on when temps get hot. They are two speed, so they will run at low speed after a moderate drive and high speed if it's a very hot day, or the engine was under a heavy load for the trip.
You have a temperature sensor mounted either on your coolant pump or your cylinder head that when disconnected, the circuit operates in a "closed-loop" mode. The fans will run at high speed when you pop the connector off.
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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