I tryed everything, tightened the belt, loosened the belt, nothing works. Mechanic said its coming from the A/C compressor.

Would it be a bad idea to just take out my A/C and use a smaller belt? My friend did this, the belt size he used is 060355 if you take out the A/C, and his squeeking is gone. Also my friend said with the smaller belt and no A/C the alternator gets more rotations because the the belt goes straight from the engine pulley to the alternator pulley, so the alternator puts out more power. Is this a good idea?

 

If you don't use your AC (and don't mind slightly reduced performance from the defroster) then sure, you can bypass the compressor.

Well I wouldn't take it out unless you're interested in weight savings, or just want to have less stuff in the engine bay.

 

if you live in long island, you might regret taking it out once the 90 deg + weather is here, but its up to you I guess.