AC Compressor not kicking in
 

ac just stopped working one day, freon is full and checked relays and thermostat, they are good, even tried to jump it at the limit sw. its not locked up and it didnt make a noise or anything, it just stopped working, when i turn on the ac the engine revs a little and fan kicks on but comp, does not engauge. any ideas? tks! 93 accord 2.2

I think the compressor clutch is fused as the rear window defroster.
Check that first
Did you try jumpering power to the compressor clutch coil to see if the clutch plate 'clicks' back to the pulley?
Or ohm test the clutch to see if it is an open circuit?
also try giving the clutch plate a little tap to help it, if the air gap is too large the clutch won't pull in.
There are thin shims under the clutch plate to adjust the air gap.

AC clutch
 

the rear defrost/ac fuse was blown, i put a new one in and if blew as soon as i turned on the AC, any ideas? tks.

Leave the bad fuse in for now...
Get your multimeter & set it to measure resistance (ohms).

Unplug the wire right at the compressor.

Take the wire & measure the resistance to a good body ground. Then do the same for the other side of the wire. Whichever side reads close to ZERO ohms, that's where you got a short.

If zero ohms from the compressor pigtail to ground, then maybe easiest to replace the compressor clutch.

If zero ohms from the car's side of the plug to ground, then the fun begins. That would be a wire rubbed bare SOMEWHERE(?) in the insulation is rubbed off & the wire touches ground. The fun part is figuring out WHERE this is happenning.