Don't know about your problem, but the "TemperaturRegular" above the glovebox is also involved in the climate controls. I think the push-button box just has relays for the vacuum solenoids behind it, plus "user inputs", though any of those could cause your issues.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans