After much tinkering and head scratching, my 134 converted (by PO) AC works fine around town. I've rebuilt the mono valve (twice) and it seems to be opening and closing as intended in low speed operation, with hot air immediately after a hot restart, then cooldown, but I can live with that. CCU has also been replaced with reman, and dash sensor was replaced. The final piece of the puzzle is highway operation of the AC. After five minutes or so of operation, the AC starts blowing lukewarm (not hot) air and will not, under any settings, deliver cool air. Two to five minutes later, operator delivers a stream of expletives, shuts off AC and opens sunroof and windows. Vent operation, blower speeds, and heat operation all seem okay. Possibly, coolant is being forced through the monovalve due to the increased pressure from the water pump at continuous high rpm, but it seems not to cool down with return to slow speed operation? Perhaps compressor is shutting off at sustained highway speed and staying off? Has anyone experienced this particular variation in CC maladies and successfully tracked it down? Gettin' hot down here in south Louisiana and I am fighting the temptation to take it to the local indy and tell him to "fix my AC" but I will if it seems like a failing compressor.

__________________
1983 CD
1958 Studebaker Packard (being resuscitated)