What would cause a blower to not work in a 1999 Buick?
Check the fuses first and the blower relay.
From what I have read online, it should be near the actual blower motor under the dash. They say it is easy to replace, but hard to get to. I plan on replacing mine as soon as I get paid. It is behind the blower motor... http://wiki.answers.com/Q/How_do_you_replace_the_resistor_on_the_blower_motor_of_a_2002_Buick_Century_The_fan_works_are_on_higher_speeds_only_Does_not_work_on_low_speeds
Either than switch, the resistor, or the relay is bad. On my 1999 Buick Century, the blower motor quit working on the three lower speeds, and then went out completely. When the resistor goes bad, the lower speeds quit working. My blower motor was squealing, also. After I replaced the blower motor and the resistor, I tested it and found the blower worked great on every speed but high. It turned out that there is…