To Ron - Yes, three years ago I replaced the temperature sensor indicated by #5 in the diagnostic tests above. Since all the temperatures are basically equal on a cold engine, I assume all the sensors are okay. Last time #5 was way out of whack. Have never had to add refrigerant to the system yet.

To Steve - so an addition of refrigerant is out of the question? Must I evacuate and start from square one?

Len