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Hi J, I believe the problem is with the resistor inside the the climate box. If you remove the covers from the side of the center consul and look carefully at the heater unit you should see a small panel (Maybe two inches square) with an electrical connection attached. Remove the plug and then the retaining screw and withdraw the unit. On the back of it you will see wire wound resistors. These are for the lower speeds of the interior fan operation and if blown the fan will only operate at the highest speed. either replace the unit or reconnect the broken wires and refit. Regards John
Can you say recall notice? Chevy knows about this problem and has extended the warranty through 2016 or 150,000 miles. Just had my 2006 Silverado fixed at dealership @ no cost to me. It takes the shop approximately 45 minutes to correct.
Usually when the blower fan only operates on hi speed, its because of a failed blower motor resistor. You still have hi speed because on hi, the power going to the blower motor goes directly to it, as opposed to the lower speeds, when the power is routed through the resistor, thus lowering the voltage, which in turn lowers the speed of the fan. The resistor is usually located near the blower motor itself, under the hood back near the firewall.
It probably is the fan switch itself. They are around $30. for a new one. You can take it out and check to see if you have power to all the settings with a ohm meter or test light. They are not real hard to take out.
you need a resister found under your air duct by the passenger floor under dash board auto zone sells these for about 25.00 you may as well buy cabin air filters while your at it . 1 of the screws will be a pain to install back into the duct work I left mine out didn,t make a difference . you might have to order it as they are a comman item oh you will need a vacuum to clean up mess from cabin air filters .this is not a hard job .
Check the relais module located inside under the rh side of the heather box you can see the connector most of them need to be replaced as they burn out you may need to replace the blower motor as well,high amp draw caused by faulty bearings will overload the blower motor controller
Call your local GMC Dealer and see if they have the climate control panel in stock. What happens is the circuit board on the back of the panel shorts out. The panel comes as an assembly and is very easy to replace. Don't go with a wrecking yard piece. I made that mistake once and it didn't work either. I got one from the Chevy dealer and it worked perfectly.