Blend door vent

Hi,

Most likely the gear is bad in the actuator. Have you tried replacing it?

https://www.2carpros.com/articles/replace-blend-door-motor

The gears in the actuator are plastic. The teeth can often times break.

Let me know. Also, let me know if it is related to a specific side of the vehicle (passenger or driver).

Joe

I will check out the actuator. It's the passenger side.

Here are the directions for replacement. They will help with you removing it. Also, here is a link that shows in general how one is replaced.

https://www.2carpros.com/articles/replace-blend-door-motor
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1999 GMC Truck K Yukon/Denali 4WD V8-5.7L VIN R
Temperature Actuator Replacement
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Procedures HVAC System - Manual Temperature Actuator Replacement
TEMPERATURE ACTUATOR REPLACEMENT

pic 1

REMOVAL PROCEDURE

CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.

1. Disconnect the negative battery cable.
2. Roll forward the instrument panel. Refer to Compartment Replacement - IP.
3. Disconnect the electrical connector from the temperature actuator that is located in the passenger compartment, on the front of the heater case.
4. Remove the screws.
5. Remove the actuator.
6. Adjust the actuator by completing the following steps:
6.1.Connect the electrical connector to the actuator.
6.2.Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
6.3.Turn the ignition switch to the OFF position.
6.4.Remove the actuator from the electrical connection.

INSTALLATION PROCEDURE
1. Install the actuator
2. Install the screws.
3. Connect the electrical connectors.
4. Install the instrument panel compartment.
5. Connect the negative battery cable.
6. Test the circuit operation.

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Let me know what you find.
Joe

Thanks a lot Joe.

Happy to help. Let me know the results.

Take care,
Joe