Video - Horsepower Loss To Fans.....

A belt driven fan without clutch will definitely use more HP than an alternator... that is why the VAST majority of so-called modern cars have electric fans. They only switch on when needed, that is only in stop'n'go traffic, maybe up the hill (not with a decent radiator) but surely not down the quartermile. And nowadays electric stuff don't break that easily... :)

PS. exemptions of the rule still apply...