Hmmmm....I've got a big heavy-duty fan, fuse is 20 or 30 amps max. You sure you have an inline 100 amp fuse? Not sure if I've ever seen a 100 amp fuse!!??

Okay, so its a "Puller", meaning its sucking air through (from) the front of the radiator and pushing it forward toward the grill, right? I've read quite a few info papers that show that is counter-productive, due to the car being in forward motion most of the time. The fan is pushing air forward against the oncoming outside air. Hey, if its working for you then more power to you.