You may (I stess may) need a new climate control module. It includes both knobs, the sliders, recirc, defrost, and the a/c button. I don't know how much it costs. Ians Europarts has them new in the box.
You will have to give us more to go on if you want some kind of explanation. Not nearly enough info. There is a lot of stuff going on in the climate control so no one answer is going to suffice.
Regards,
Max
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Max
91 944S2 Cabriolet
89 911 Carrera (fomerly)
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