I already changed the climate control but still only works on hi speed only is there any thing else I can check or replace
Heater/ac only blows on hi speed doesn't work on any other speed on 2003 Chevrolet Impala
Could be that the other speeds of the fan is burned out and you might have to replace the blower motor.
blower motor resistor
The "resistor pack" in the blower duct is bad....