Blend door
#3
It'* a manual--sliders for temp and fan speed. I already replaced this unit and things were fine for a while but then the fan went to hi speed and wouldn't shut off. I pulled the fan motor and applied 12v to it and it worked fine. Can't find any indication of a blower resistor assembly anywhere. I theorized if it was shorted that would make fan run continuously.
#4
Unless the relay got stuck in the "on" position. When the blower switch is on low and medium, it uses a resistor to control fan speed. But when in high mode, it bypasses the resistor and uses a relay to deliver full 12V power to the blower. Or you have a broken blower switch.
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#5
Unless the relay got stuck in the "on" position. When the blower switch is on low and medium, it uses a resistor to control fan speed. But when in high mode, it bypasses the resistor and uses a relay to deliver full 12V power to the blower. Or you have a broken blower switch.
#6
I'm not sure myself, but I did look up your 2004 Buick Lesabre on RockAuto Parts Catalog and it shows this as being your blower motor controller....
Not sure where its located in the vehicle, could be under the dash. But the AC Delco'* run about $88.
Not sure where its located in the vehicle, could be under the dash. But the AC Delco'* run about $88.
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#7
Unless the relay got stuck in the "on" position. When the blower switch is on low and medium, it uses a resistor to control fan speed. But when in high mode, it bypasses the resistor and uses a relay to deliver full 12V power to the blower. Or you have a broken blower switch.
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olscout99
Everything Electrical & Electronic
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02-02-2009 05:32 PM