A/C keeps popping fuse

All the sudden the A/C keeps popping the fuse. The clutch turns, looks normal. It was working fine and all the sudden, pop.
Is the compressor out?

I have had problems like, a/c would work but if I turn it off the a/c would come back on hot, like the freon was out.

If the truck was cold the a/c would work.

I can get a compressor for $105.00 with exchange, should I replace it?
Do I need to flush the old freon out or can I just add new freon?

1991 s-10, v-6 4.3l 159k miles
Thanks

bump

Put a set of gauges on your system and check the pressures with engine/AC running. If the pressures are the same on both low/high sides, your compressor is shot.

I can not turn on the AC the fuse pops immediatly