After replacing blend door it is stuck on vent position?

BLUE04

MEMBER
2004 GMC SIERRA
5.3L
V8
4WD
AUTOMATIC
224,000 MILES

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?

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 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.

Image (Click to make bigger)

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Friday, July 30th, 2021 AT 10:17 PM

BLUE04

MEMBER
2 POSTS

Mode actuator is what I replaced. As seen above.

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Sunday, August 8th, 2021 AT 12:17 PM

ASEMASTER6371

MECHANIC
52,797 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

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Wednesday, August 11th, 2021 AT 3:45 AM