Thanks, that's ok. Anyway, I scratched out my own 2 suspects. To make a long story short, the clutch is working. Ergo, the pressure switches are ok, for now. Even my suspicion that the high pressure switch was being activated by blockage didn't turn out to be true. The clutch stays engaged as long as the A/C is on.
And while the air is not being cooled, there is a little portion of metal tubing that is cold enough to sweat. It is the portion that goes to the evaporator inlet after a fitting, just below the accumulator.
Given Ltlfrari's picture, I now suspect that if I open that fitting I'll find the orifice there and it will be, indeed, clogged. If so, I would have expected a clog to provide enough back pressure for the H.P. switch to activate and shut off the clutch. It doesn't happen.
So, I am not 100% sure of anything...but now I am willing to bet that replacing the orifice tube will deliver results -- even if the compressor is going south anyway. I would have to get proper guages, evacuate the system and get a vacuum pump before recharging. As always, these things happen when the dollar tank is empty!
Ideas continue to be welcome and very much appreciated.
[This message has been edited by Jdlog (edited 10-02-2003).]