1992 C4 climate control question

The person I bought the car from didn't provide an owners manual.

Can climate control be shut off and the AC and heater be operated manually? I suspect my AC is on all the time. If it can how so?

ALSO:
How do you program a radio station. In my C5, pick the station, hold the desired button for 3 seconds.

This one a 'set' button. I tried it the C5 way but didn't work. Can I get some help?
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