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REMOVE HEATER BLOWER MOTOR HOT WIRE BLOWER MOTOR IT.IF IT WORKS.YOUR AC AND HEATER CONTROL SWITCH IS FAULTY.CHECK HVAC FUSES AND CHECK BLOWER MOTOR RELAY.IF BLOWER MOTOR DONT WORK WHEN HOT WIRE REPLACE IT.IF ALL CHECK OUT GOOD.HAVE DEALERSHIP DO A DIAGNOSTIC TEST ON YOUR CLIMATE CONTROL SYSTEM.
There are actually two possibilities for your issue. First is the blower motor resistor as you stated as a possibility. The blower motor resistor is usually located inside the blower motor housing unless the blower motor is mounted horizontally and is accessible from the engine bay (which I do not believe is the case in your Buick) in which case the blower motor resistor is going to be located in close proximity to the motor.
The other possibility is that the ignition switch is going bad. Now, this may seem strange at first, but GM ran much of the power for the accessories through the ignition switch and as a result, carbon builds up on the contacts and starts to affect the operation of the accessories. However, I dont think this is the case in your issue as that is normally accompanied by issues with other accessories like the radio and such.
I think it is more likely that the blower motor resistor is bad in your case. I believe your blower motor is located on the passenger side, against the firewall close to the center console. If you contort yourself in a way where you can look at the bottom of the blower motor housing you may see a connector on the bottom, or a small access panel. If so, that is likely the blower motor resistor.
I had the same problem with mine and I replaced the blower motor, and still didn't work. The problem ended up being the blower motor control module. I have the auto temp control, so my replacement part was pretty expensive. Found a used one online fairly cheap. Hope this helps.
your blower control has gone bad it is under the cowl panel on firewall only way to repair is replace this it will be about in the middle of the air box. should be a plastic panel with i think three finger screws you remove it and will see it