I'd guess ac compressor hub clutch of ac compressor bearing...bearing
doesn't go bad that often unless the hulk is your mechanic and he's been
tightening the belts...but if it's only there hot or cold when the ac is
on...it's probably either compressor, compressor clutch, or heaven forbid
the entire compressor...be careful now...it's just as much work to r&r
compressor and replace just the clutch as it is to r&r compressor and
recharge system.....and sometimes rebuilt compressors come without clutch
hub so they'd just swap compressor, put old clutch hub on and you'd have a
new compressor old clutch hub and still have the noise...take it to a
reputable and I stress reputable air conditioning shop in your local area
and pay for the diagnosis...most reputable shops will apply the diagnostic
charge to repair if you let them do repair...good luck and happy motoring...
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