Electric fan

A few basics (IMHO):

If your battery stays charged over a week of driving, your alternator is doing its job. It doesn't have to meet the peak load, which is why your car has a battery (unlike some 1970's 2-stroke motorcycles).

If you install a bigger alternator, design so your wires won't melt.

Mechanical clutch-fans work better and continued for a long time in longitudinal engines. The best electric fan is the Taurus 2-spd which hot rodders like. You can buy integrated fan controllers w/ relay and temp sensor fairly cheap, which beats "roll your own" design.