About the only cure for a squeaky belt with the serpentines
is a new belt. You may have to clean the belt dressing off
the pulley when you install the new belt.
The alternator problem may be an engine idle control
problem. The IAC on those tend to become dirty and gummed
up after a while and neew either a good cleaning or
replacement. If yours has never been cleaned or replaced,
it has been due for a while.
I replaced the IAC about 2 years ago. The engine ran poorly at idle so
I relpaced it. I'm not sure why this would cause tha alternator light
to come on occasionally. The engine seems to be running okay.
The alternator has a cutout point which can be reached when
it is not being turned fast enough to produce enough
current. If the IAC is not maintaining a high enough idle
speed, the alternator cuts out as if the engine is not
running at all. You may also see the A.C compressor cut out
for the same reason. A funky IAC may not set a fault code
or give you a fault light.
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