2000 Buick Century Problem: Fan does not work in low speed settings, but does work when fan switched to "Hi". Changing low fan fuse did not help. Any suggestions for additional testing or a final solution?

The fan switch in high position, feeds full 12 volts to the blower motor. Lower settings rout power through a blower resistor or resistor modual, usually located in the heater box under the passenger side dash. Labor guide time to replace is .5 hours. The part is 60.00 through the dealer

Test and replace blower motor resistor

High blower relay or the connections that plug into it. Not able to tell you right now where it is located, but usually under the hood on passenger side near the firewall.

I have a 2000 oldsmobile did the same thing.. i replaced my blower motor under the dash on the passenger side... cost me about 50bucks and it fixed my problem