I have Yukon SLT that just replaced the mode acutator on and air stills blows out the defrost vents

2002 GMC YUKON
42,000 MILES
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ESTIVENDER
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  • 2 POSTS
when I pluged in the new motor it rotated clockwise and stopped. It will rotate back no matter what the vent selestor is set to.
Nov 18, 2011 at 9:10 AM
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CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
test the vacuum going to the a/c panel.you have a vacuum leak some thing is leaking.check all the vacuum hoses.
Nov 18, 2011 at 9:27 AM
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ESTIVENDER
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  • 2 POSTS
there are no vacuum lines on this model for a/c, it uses dc servo motors to operate the blend door and the fresh/recirculating vents.
Nov 18, 2011 at 9:41 AM
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RIVERMIKERAT
  • ✓Experienced Mechanic
  • 6,110 POSTS
Is the dc motor maybe hooked up backwards? That would make the motor turn in reverse.
Jan 26, 2012 at 11:32 PM
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