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

Tiny
ESTIVENDER
  • MEMBER
  • 2002 GMC YUKON
  • 42,000 MILES
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.
Friday, November 18th, 2011 AT 5:10 PM

3 Replies

Tiny
CADIEMAN
  • 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.
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Friday, November 18th, 2011 AT 5:27 PM
Tiny
ESTIVENDER
  • MEMBER
  • 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.
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Friday, November 18th, 2011 AT 5:41 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Is the dc motor maybe hooked up backwards? That would make the motor turn in reverse.
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Friday, January 27th, 2012 AT 7:32 AM

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