I have a 1995 Buick LeSabre, the heater blower works in three of the four positions. Position 1,2 ok 3 inop and max ok. Pulled controller and found very sturdy switches, cleaned these up and added contact cleaner protector. I have a schematic. The main relay is ok or I wouldn't get the first 3 positions on the blower. I know the controller is good because I checked it with a milliohmeter @10 microohms. The blower is good because it works on max and other two positions , all I can guess is that the blower resistor or connectore are bad, schematic is poor doesn't show location of resistor or any connectors except at the controller, resistor box, relays and motor. What I really need to know is the location of the resistor box, I could trace the wire but I don't want to mess up the factory wrapping any more than I have to. A factory schematic and manual woul be much better, and more expensive than the aftermarket el cheapo I bought.
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.
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