Sometimes the fan won't even turn on but I leave it on position and after driving a 1/4 mile or so it will start blowing hot air! I've replaced the blower motor resistor twice and mechanic says it is blown out and needs replacement again, (last 2 summers) but it only solved problem temporarily. After a few weeks it blows hot air again.
How long has your 2001 Buick Regal had this problem?
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The blower motor going out and the blowing of hot air are not related. If your ac is out and all you get is hot air than I'd start with checking the refrigerant level. If the blower keeps going out I would ask the mechanic what kind of parts he's using.
Alex
