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how do you know if it is the heater blower or the heater blower resistor?
Generally when the blower motor resistor fails, the blower fan will work on the highest setting and not the others. If the fan doesn't work at all, check for power and ground signals to the motor and go from there.
Q&A > Chevrolet > 2003 Chevrolet Impala
Q&A > Chevrolet > 2004 Chevrolet Impala
Q&A > Chevrolet > 2002 Chevrolet Impala