Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hello I will help,
Do you have an automatic blower system where you just set the temperature?
Ok, the blower motor speed control transistor has failed, if you can find one replacing it will restore the system to normal operation.
Let me get you locations and see if I can find a source for the transistor.
I believe this will be what you need, compare it to the module you find in the top of the box to the right (passenger side) of the blower motor. The part is expensive, for a few years it was not available at all. It is the 4P1403 Airtex part.
You will need to remove the fuse rack to get to the module that needs to be replaced.
Let me know what I can do to help
Are you still with me??