They put two fans on some of the newer cars because it consistently cools down the motor. They are also a safety feature so you are less likely to overheat and possibly catch a fire under the hood. Also if one of them ever goes bad you have another one for backup just incase.
When you pop the hood and look straight down you should see a big metal bar running from one fender to the other. On the engine side of this bar you should see your radiator and to big black humps. Under the humps are where your two fans will be located.