2004 chevy Impala
The blower motor not turning on, Probably the Blower Motor Resistor thats located right by the blower motor.
Can you hear the fan blowing? If so check to see if your car is equipped with cabin air filter. If so remove and inspect if clogged up. If all that checks out then check to see if something is blocking the intake duct work. Or possibly an actuator in the ducts acting up.
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