My 1999 Buick Century blower fan only works on HIGH. I beleive the issue is the heater blower motor resistor. Where is this located at on the 1999 Buick Century?
heater blower motor resistor on 1999 Buick Century
There is a fuse labeled "low blower". This fuse controls all speeds except high. Check that first. There is a separate fuse for high speed. If the fuse is good, the problem is probably the resistor module. It's right against the firewall behind the blower motor.
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It is on the under left side of the blower motor, some of these cars have a blower motor module and some use a resistor.