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Doesn't work on any speed ? high - low . Does your's have manual or automatic climate control ?
Don't think a fuse problem , blower motor control processor more then likely .
Blower Motor Control Processor
The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage, and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.
Look here for fuse location an wiring diagram's http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size. Under system click on HVAC , subsystem HVAC controls . click the search button then click on the 5th blue link . This show's fuse location an wiring diagram for the blower electrical circuit . If you don't know where the rear fuse box is ,it's under the rear seat . It would be easier to just check under the passanger side dash at the blower motor control processor at the orange wire .
Do you know how to test electrical circuits with a voltmeter ?
Do you know how to test automotive electrical circuit's , looking at a wiring diagram so you know what all is involved in the blower motor circuit . Using a DVOM - digital volt ohm meter to test the circuit . Free wiring diagram's here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click HVAC ,then under subsystem click on HVAC controls . Click the search button then the blue link .The thing's that could be wrong , blower motor it's self , the blower motor controller for automatic climate control , a blown fuse -but fuse's don't just blow for no reason - short to ground maybe ! 40 amp fuse #1 in the under hood fuse box . Blower motor resistor block if your vehicle has manual climate control . Test And Replace Blower Motor Resistor Chrysler Town Country Caravan
F4 30 amp under hood fuse box , F45 5amp - smart junction box ( passenger compartment fuse box ) right or left kick panel probably . Also ,there is a blower motor relay - under hood fuse box. You can check those but don't think it would be one of those . More then likely it's the blower motor speed controller .
Could be ! could also be the blower motor is bad or blower motor control module .
Does you buick have manual or automatic climate control ? There is a fuse box under the rear seat ,that is where fuse is for blower motor .HVAC BLWR fuse 40 amp. Chevy Trailblazer EXT Blower Motor Won Turn Off
You probably have a bad blower motor control module .First check the Batt. 4 fuse 30amp in the under hood fuse box .
Blower Motor Control Processor
The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the blower motor speed control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground or low reference as a low side control to adjust the blower motor speed.
COULD HAVE CORROSION INSIDE FUSE AND RELAY BOX CAUSING POOR CONTACT IN ELECTRICAL CIRCUITS. REMOVE FUSE AND RELAYS TO CONTROL CIRCUITS SPRAY A LITTLE ELECTRONIC CLEANER ALLOW IT TO DRY.CHECK BLOWER MOTOR RELAY IT COULD BE BAD OR BLOWER MOTOR RESISTOR BAD HOT BLOWER MOTOR TO SEE IF BLOWER WORK IF NO YOU HAVE FAULTY BLOWER MOTOR. IF BLOWER MOTOR WORKS WHEN YOU HOT WIRE BLOWER MOTOR CONTROL SWITCH COULD BE BAD.RADIO AND POWER PROBLEM COULD BE IN THE FRONT CONTROL MODULE IF CLEANING OUT CONTACT WITH ELECTRONIC CLEANER.DEALERSHIP HAS TO CHECK IT OUT.
CHECK HEATER AND AC IGNITION 10 AMP FUSE UNDER HOOD JUNCTION BOX.IF ALL IS GOOD CHECK BLOWER MOTOR FUSE AND RELAY.IF ALL LOOKS GOOD. TURN ON CONTROL SWITCH TO CHECK TO SEE IF POWER GOING TO BLOWER MOTOR IF YES BLOWER MOTOR BAD.IF NO POWER GOING TO BLOWER MOTOR FUSE AND RELAY GOOD.YOU HAVE BROKE WIRE BETWEEN SWITCH AND BLOWER MOTOR OR CONTROL SWITCH FAULTY. TO GET TO BLOWER MOTOR ITS LOCATED UNDER THE DASH ON PASSENGER BEHIND GLOVE COMPARTMONT YOU DONT HAVE TO REMOVE GLOVE BOX ITS JUST BELOW IT FAR BACK.YOU NEED TURN OFF RADIO FIRST THEN DISCONNECT NEGATIVE BATTERY CABLE WAIT 20 MINUTES THIS DISABLE AIRBAGS AND THE BCM.REMOVE BLOWER MOTOR HOTWIRE IT TO SEE IF ITS WORKS. IF NO BLOWER MOTOR NO GOOD.IF BLOWER MOTOR GOOD THE AC AND HTR CONTROL SWITCH IS BAD DEALERSHIP FIX.