What a wonderful thread! Wizzer, I had problems with heater control also on a 2000 mile trip to New York state. Arrived home and came across this forum and was able to make at least a temporary repair (by tightening locknut) and it has been working for about two weeks perfectly. I will now know what to do if and when it quits altogether, but will leave as is until that time.
Congratulations to Wizzer and Bfluitt for your info and pics, as well as others who have contributed to the wealth of knowledge here. Saved big bucks thanks to you all.
Alan
