Verified answer

the a/c compressor or a/c clutch is shot. have it replaced

I would check the fan belt it sounds like it is slipping it might need to be tighten up a little hope this helps!

mustangman is right ac clutch possibly tensoner pulley it can create a squeal with ac on because it then creates a greater load

Either low on headlight fluid or need a new flux capacitor.

i had the same prob when ya air con goes on it uses more power and strain on the fan belt it needs tightening..............