Buick Repair Questions? Ask a Mechanic for Answers ASAP
hello . I can assist you here . the first thing you will need to do is see what the voltage is at the blower motor with the fan speed switch set to high or Max .
sounds good . I have included the blower wiring schematic . just be sure that all the fuses in this schematic are good .
when the voltage at the blower was on the Hi setting , the voltage was at 4 Volts and then jumped to 12 Volts ? was he measuring this with the Blower plugged in and did the blower speed change ( to full speed ) at 12 volts ?
he needs to check the purple wire from the motor back to the fuse panel and the control head . If you look at the diagram you can see a splice in that circuit check the splice . also check the terminal ay the control head to see if it looks " burnt "
no problem . happy to help