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It happened once before, but I don't recall what the Quality Chevrolet said caused it. the heater works on high setting, but not on any of the lower blowing settings.
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The most common fault with the blower motor on your 2001 Chevrolet Impala would be the blower motor speed control resistor block. The blower switch should be tested before replacing the resistor. AutoZone has service information available on their website - www.AutoZone.com. You may fine what you need there to diagnose your blower motor resistor.