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Re: very bad noise from frontof air compressor
You probably have bad bearings in the A/C clutch pulley. Remove the drive belt and spin the pulley for noise and shake it around for play. Any noise or play and you need a new clutch. Also see if the front hub on the compressor turns easy. If not, then the noise could be the compressor locking up. Reman compressor might be the least expensive route.
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This problem sounds like the aircompressor pully, the bearing is shot.
With the engine running and the air conditioner off there is a grinding noise, look at the compressor pully, does it wobble? Then turn on the air conditioner and the noise stops, look at the compressor pully again, the wobble stops? If so that's the problem.
your a/c should not blow cold air-- is the switched turned on inside your truck - yes there needs to be a belt and it a round compressor with a clutch on the front of it - located on the front top side of your motor
if its a new body style (with the round front - i am assuming because it has a 5.3) then it takes 2.0lbs (.91kg). Make sure you check your fan clutch to see if it spins freely or has some drag to it. the fan clutches usually fail causing the compressors to come apart, the failed ones spin freely.