replacing resistor on 2004 GMC Canyon

the heater blower switch only works on high how do u replace it and where is it located

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2 answers
NEXT TO BLOWER MOTOR. YES REPLACE IT ALSO CHECK PLUG FOR SIGNS OF HEAT
FROM BAD CONNECTION NEW PLUG AVAIL. FROM NAPA.
MOUNTED IN HEATER BOX BUT REPL WIRE HARENESS ALSO