2003 Chevy S-10 Heater controle issue

2003 CHEVROLET S-10
83,000 MILES • 6 CYL • 4WD • AUTOMATIC
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GREATGOOBER35
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Hi all I'm trying to figure out why my selector switch on the heating control will not work correctly. It will turn on and off, but when you select any thing from a/c to defrost it will blow out all vents instead of the one selected.

What could be the issue be?
Jun 28, 2010 at 10:27 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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