Why will my aa/C and Heat only blow from defrost vents.

2000 CHEVROLET SILVERADO
173,000 MILES
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CTT
  • MEMBER
  • 1 POST
The vent position control switch has no affect on adjusting where the air blows. I changed the whole A/C Heater control module and this did not help.
Dec 29, 2011 at 4:39 PM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,989 POSTS
must be on other end, the mode door actuator.
Dec 29, 2011 at 4:44 PM
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