On 03/21/2013 06:04 PM, Bimmer Owner wrote:
> Still, if the problem is that the blower motor is merely using more
> current as it gets older, why wouldn't a NEW FSU burn up within a
> few weeks of insertion?
If the unit is near its limits it might just get very hot and parts
start aging very fast -> semiconductors will just fail after a little
while. The new unit should fail sooner than the old one but who knows
who soon, maybe after a few years. Peugeot's ( and Citroen) used just
one huge pnp darlington which failed quite often , it was working too
near its operating limits.

(just my 2 cents)
ismo