Theres a switch on the block take a small piece of wire and jump the connections in the connector to one another if the fan comes on, you have two options.
1. leave the two connected so that your fan comes on all the time with your key. ( bad for dyno runs with big caged fan, takes longer for the car to reach operating temp in which in turn keeps the car in limp mode or start up mode, so you cant a get a proper tune)
2. By know youll know that you just need to replace the switch

hope this helps