Why do you need all that stuff?
You can get an e-fan from any junk car for $20... check what's being parted out on your local Craig's List site, and get some measurements for your vehicle.
The only other thing you need is a thermoswitch set to whatever temp you want the fan to come on at, usually ~200degF. Wire the fan direct with the switch and a 10A inline fuse to the battery, nothing else is necessary.
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