Yes. You absolutely need to re-wire it. Or, if wiring is not your niche, have someone else do it for you.
You were overloading the circuit, that's why the fuse popped; the fuse is a failsafe. Then, placing a larger fuse in the circuit, you were still overloading the circuit with the tiny wiring, creating heat, and eventually...fire.
Best bet: Buy a radiator fan controller that has a thermostat built in, then have someone who is comfortable with wiring, wire it in for you...Spend the money; it is worth peace of mind.
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