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If you have RPO C68 electronic climate control then to operate it manually just select the fan speed, the temp, and the vents you want to use. The "AUTO" light should go out when you make your own selection.
Tune the radio to the station you want, press set, the set light should come on, press the number button that you want to set for that station. To set the time turn the radio off, press the set button, the set light should come on, press the tune up and down buttons to change the minutes and hours.