98 Cadillac Deville - AC cools intermittently

I will turn down the temp so the AC will come on and it will blow out hot air out of the AC Vents and sometimes it will change and blow out of the defrost vents, and then sometimes after quite a delay, few mins or an hour
it will just suddenly start blowing cool refrigerated air. Does anyone have experience with this?
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I'm sorry, it is a 99 Cadillac Deville
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