Here's a pic of mine from when I upgraded to an Airtec rad:



As you can see there's four bolts holding the fan frame to the rad - one in each corner. Each fan's mounted to the frame with 3 bolts, so not amazingly difficult to remove or install. The fan switch is screwed into the radiator's lower left corner:



The radiator's bolted to the chassis rails with one bolt on each side - remove the front bumper or get it up in the air to get to them (you can see the red part of the fan switch in the middle of this picture):