I wanted to wire this fan by just using a switch placed inside the car so i can manually turn it on and off. I wanted to know which type of fuse i would need because i am uncertain of how much the fan motor draws.
At a minimum you really need a relay. You could try a Bosch 50 amper from FFI for 5 bucks or so if you don't want to spend 25 on the proper Bosch 75 amper (the latter is a very robust unit compared to most SPST relays).