Air conditioning heater control will only work on 4 and 5. How can I fix this? on 2003 Chevrolet Suburban 1500

Do I need to replace entire control module?

Asked by for the 2003 Chevrolet Suburban 1500
2 answers
the blower switch or blower resistor they both control the blower motor speed.
I agree, check the switch and resistor.
I agree, check the switch and resistor.