blower fan turns off when turned to 4 and 5
Bad blower motor resistor ... some of the newer GM's have access to that resistor under the carpet inside the car. You have to buy the complete resistor module~~~~~ http://www.ebay.com/itm/A-C-Heater-Blower-Motor-Resistor-OE-89019100-NEW-for-Buick-Chevy-GMC-Isuzu-Olds-/331407134872?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A2006|Make%3AChevrolet|Model%3ATrailblazer&hash=item4d29679098&vxp=mtr
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