Gary,
There were only 2 types of systems offered for A/C cars, a manual and an automatic control. Despite the Spartan operator controls on yours, it is the premium automatic system. Based on the description, behavior, and pictures yours matches the Automatic Climate Control system except for the faceplate. Its function and troubleshooting are covered in the chassis shop manual beginning on page 13-84.
The faceplates on the 68s consisted of a thin painted aluminum applique applied over a plastic lens. These did not hold up well over time. By now many of these are pretty battered. Plastic replacements, at least for the manual control type, are currently available as an aftermarket item.
From the pictures it looks like someone has redone the faceplates on the dash. The clock has been replaced with gauges. The lettering on the cruise control and courtesy light switches is positioned differently and has a different font from the originals. Can't tell from the picture if the fiber optic indicator for cruise status is present. The markings on the A/C control are for the manual system. The script Climate Control lettering looks to be a paste-on label. It should read Automatic Climate Control. So maybe this a home-made faceplate on the A/C control that is causing the confusion.
If you would like, we can continue on with a new thread in the Climate Control forum. That way the topic will be easier to find should anyone else start searching.
What has been, can be again. (Bob Wills, 1942)
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