I guess it would be good to clear up the ambiguity of "right side of the engine". Normally, the "side" is as referenced from the driver's seat. So "RHS" would mean the passenger side of the engine compartment.
A really simple test for squeals is to spray a little (very little) lubricant like WD40, or silicone or teflon spray onto the belt while running and see if the squeal is affected. If so, its the belt. If not, you will have to "catch" the noise with a stethoscope or careful directional listening(very tough, thats why a mechanics steth is important for pinpointing noises). From your description, it could be the idler pulley. Some have also reported the fan clutch bracket pulley as making noise and needing replacement especially if you have a lot of miles on it (>150k).
How many miles on your 92 LS400?
its more of a rattling than a squeling, like a bearing.
200 000 miles. So the idler pulley is the one next to the power steering resevoir? Honestly i love this car but all these picky small things like this are a PITA. Is it really worth it to replace all this, or should i just sell it?, so far i did my upper control arms myself, lower ball joints by the mechanic as i didn't have time, a bunch of small stuff not worth mentioning. Today im draining the rad to get to the distributer cap and rotor. Also i need motor mounts was hoping to do myself but it looks complex....I need brakes and rotors too. so again is it really worth it?, my dad keeps saying im putting so much money into it and it will break down. so i guess what im saying how much is this car going to cost me to keep it for the next little while?