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I'm not sure of the year you're talking about, but in general this is pretty common with some newer GM's. I'm also assuming that you mean the blower isn't working with the lower speeds.
I would probably take a look first at the blower switch to make sure it doesn't feel loose. What I'm really guessing is the blower resistor, however. The factory design on a number of these is kind of questionable and they seem to overheat & burn up over time. I know Wells (an aftermarket manufacturer) has addressed this and has a beefier design.
I heard it could be the resistor, its on the fire wall behind the blower in the engine compartment where the wires hook up to. my blower only has one speed and that's what they told me to replace.
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