After replacing blend door it is stuck on vent position?

2004 GMC SIERRA
224,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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BLUE04
  • MEMBER
  • 2 POSTS
Several issues but starting with the easiest to explain. I have replaced the blend door for vent positions as well as the control unit in the dash. It was originally stuck in the defrost position. Now after putting on the new actuator and doing a recalibration, it is stuck in the vent position. What can cause this?
Jul 30, 2021 at 9:58 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Hi,

Was it the blend door actuator or mode door actuator that you replaced? Air flow direction is controlled by the mode door actuator.

I attached a pic below showing the mode actuator. Let me know if this is what you replaced.

Joe

See pic below.
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Jul 30, 2021 at 3:17 PM
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BLUE04
  • MEMBER
  • 2 POSTS
Mode actuator is what I replaced. As seen above.
Aug 8, 2021 at 5:17 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good morning,

I would remove the actuator and move the door in the case manually to be sure there is nothing not allowing the door to move according to the command being sent.

It could be a door issue there not allowing smooth movement.

Roy
Aug 10, 2021 at 8:45 PM
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