Noticed that the compressor cycles about 6 secs on and that's it (while stopped). Several suggestions were clogged orifice tube (not sure where it is on this truck) bad clutch fan or leak/low refrigerant. Temperature gauge never really fluctuates and while driving the AC seems to be operating well, but not totally up to what I would say is quite as cold as normal. Most people don't notice so maybe it's just me.
Any suggestions, links, schematics, troubleshooting steps would be much appreciated.