but that's not going to apply to multiple different unit manufacturers, over long periods of time.
um, because it's a profit center? either they charge you $100 for a $6 unit, or you get fed up with the vehicle and buy a new one. that latter is the psychology of their target market.
indeed - a very good point. which begs the question, if they can pwm the aux fan, wtf can't they do it with the blower fan???
bmw are designed, root and branch, to be expensive to maintain and own after the warranty period. they spend a lot of money on r&d to achieve that. and even more on advertising to convince their target that the extra cost is justified for membership of the "ultimate marketing tagline" club.