a/c produces cold when running. It may run several miles down the roan, then the compressor only stops running, everything else remains running. Turn the A/C switch off/on several times and the compressor starts and cools efficiently. Traveling a few more miles it may stop and then I repeat the on/off procedure. It usually goes back to cooling. I'm thinking a pressure switch..

You are likely dead on--replace the A/C clutch cycling switch. Coat the threads of the new switch with PAG oil. Afterwards, I would attach a manifold gauge set and check the low and high pressure readings. It will give you a chance to also see the A/C clutch cycling switch in operation.