I have the same problem with my 280ce, the alternator belt squeaks/ whines
when the lights/fan blower is on, but only when the car is idling in "D". It
also lets out a yelp occasionally when starting the car.
I have fixed the problem by the application of a spray belt dressing. this
is best applied through a tube to the relevant pulley, as the belts are
inaccessible.Spray down the tube and let it drip onto the pulley(s), crank
the motor then repeat. it works a treat .The belt is probably in need of
tightening, but this will wait until the scars on my knuckles heal from the
last spanner wielding session. Good Luck, Nigel
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