I have an 01 convertible lxi that just did the same thing..... You can go to an auto parts store or in my case, I went to Firestone and had them replace the blower resistor. My air now works on all settings.
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I assume you mean that the blower motor quit running. Did you try it to see if it will run on any speed? If it won't run on high, but runs on the lower speeds, it is most likely a bad blower motor high relay. If it will not blow on any speed, it could be the blower motor fuse (In which case, you must find out why it blew or it will only happen again.) or the blower motor itself. Buick Century is known to burn the connector at the blower motor. There is a replacement connector available in the aftermarket to repair this. I personally recommend replacing the blower motor also if it is a burned connector because the blower motor is usually partially shorted internally, which is what causes the connector to get hot and burn.
Yes I would go with the switch, BUT, does it have a resistor bank? That is, how does it reduce the speed? Many systems use resistors to lower the speed. Burnt or bad connections can cause this as well.
You can test the blower motor by connecting direct power from a source like the cigarette lighter if you are handy.
Most of the time the lower speeds konk out but the high speed continues to work this is the resistor bank that goes out.
Check for a blown heater motor supply fuse,
Check operation of heater motor control relay,
Check operation of fan speed control switch,
Check heater motor speed control resistor pack (usually located in the heater ducting - in the air flow),
Check the heater motor runs if power directly applied to the motor- if not motor may be faulty.