Peter; If '68 is close enough, I have the "Principles of Operation 1968 Auto Temp System" Technical Training book as well as the Master Technicians Service Conference Reference Book 68-4 "Auto-Temp Diagnosis (Testing It)". These are two of the various bits I plan to place in Mike and Chris' hands when I see them in Iowa, so they can be available on the IML site. Let me know if you could use any snippets from either of these, and I can scan them for you. Cheers, Roger '68 LeBaron asleep with stuck 440 and AutoTemp I