heater blower fan works 0n 5 speed only. How can I fix this problem? on 2003 Chevrolet Malibu

Speeds 1,2,3, and 4 went out gradually over a period of time. Have a problem with leaves and acorns falling into grille.

Asked by for the 2003 Chevrolet Malibu
Blower resistor is the most likely suspect! Is the blower noisey?