2003 Chevy S-10 Heater controle issue

2003 CHEVROLET S-10
83,000 MILES • 6 CYL • 4WD • AUTOMATIC
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GREATGOOBER35
  • MEMBER
  • 1 POST
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 3:27 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Have the HVAC control module tested
Jun 28, 2010 at 4:00 PM
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