I have a 1989 park ave.on my air condition compress,the little wheel on it is spining and it's making a real loud grinding noise.

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Park it! You need to check fluid level and condition, before you do real damage.

Shift the transfer case to N while it is making the noise. If the noise goes away the transfer case is the culprit.

Check front tyres & wheel bearings espesially the R/H/F. Feel tyre for high / low spots on inside & jack up & spin wheel if you get noise while jacked up it is not the tyres but wheel bearing or brake pads but more than likly a crook bearing by the sound of it. It needs to be tended to ASAP

sounds like power steering pump is going out or low on fluid

Grinding noise in the front end could be your bearings or you cv joint

I would investigate the transfer case. By your description here it sounds as if the gears inside are worn and the drive chain inside is rubbing, causing the loud noise you hear.

One of three things. I would start with removing the belt and checking the idler and tensioner pulleys to see if they are running smoth. The third item would be the ac compresor brg.

sounds like the power sterring pump check valve is failing because it only when you turn, try to turn the wheels standing still to verify the noise, if noise present, replace the ps pump.

Sounds like the wheel bearings are worn. May begin to start "popping" and/or grinding after awhile.