Those fuses have nothing to do with the cabin fans. The A/C fuse is for the compressor and the Aux fan also has to do with the A/C by "by-passing" the auxiliary cooling fan's temperature trigger.

Not all A/C system installations used the fuse for the auxiliary fan. Some triggered it by using the A/C clutch circuit to activate the circuit.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now