Already got it replaced ($250) on my truck (which has about 90k
miles), but what's "haunting" me is should you replace things like
that just because they make a squealing/screeching/.... noise? At
the time, i just listened to the mechanic who said i should replace it
(because "bad things can happen if it dies..."), and he said it
couldn't be fixed because it's a "sealed" part. The noise wasn't so
loud as to really annoy me, but it was fairly noisy. But who knows if
a noise like that is really a predictor of failure...is it like a 3-
fold risk of breaking down within a year, or what? It seemed to
definitely be the fan clutch making the noise, since when he twirled
it around with his hand, with the engine off, it made the noise .
Now that it's "fixed", the truck has a new "feature" (that i've read
about...other people seem to have this problem).....The first mile of
driving (at under 30 mph) has that roaring sound....and the truck
never did this before....but from what i've read, that's not really a
mechanical problem, just a "feature" of some of the cooling fans.
p.s. i also replaced the serp. belt (after only about 12-13000 miles
(but 3 years), because it looked a little bit glazed (and some people
said it looked almost already to replace). .