First off, I've done a bunch of searching on the forum and there is so much to plow through that while I have learned a lot about AC, I have not seen my issue (though I am sure it is out there somewhere). I have not dealt with AC much in my life, though I do all my own maintenance on all our cars (from simple to really major). '99 Explorer AWD V8, R134a (original) Here's the readings at 1500 rpm, after stabilizing: Ambient: 80-81F, Center vent temp - 72-73F (that's what the themometer said, but I don't think I was getting it in there well enough - air was cool but not cold like it should be) Hi side 100psi (below limit) Lo side 97-105 psi (above limit) On time - 8 sec (Below limit) Off time - 6 sec (OK) Total cycle time - 13-14 sec (Below limit) #cycles/min - 5 (above limit) If I believe the Helms manual diagnostic tree, it says "check orifice tube - if present, compressor is weak - replace compressor." Well, the system has never been opened (original owner), and it was starting to get weak last year but fine before that so the orifice tube is "present". Even though it doesn't say it in the manual, is this possibly a low R134a issue? Or is it time to replace compressor (and accumulator, natch)? I can get the Vacuum Pump From Hell on the lend-lease program from work, so I might even be able to do the whole thing myself. Thanks for any help.