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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
I agree, check the switch and resistor.
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2 more answers
I agree, check the switch and resistor.
the blower switch or blower resistor they both control the blower motor speed.