Blend door actuator replacement

Air conditioning works fine, but when I turn the ignition off sound keeps going for approximately one to two minutes. It only happens when I use the air conditioning. It is a tapping sound. What will happen if I do not have it fixed? Will the air finally start working? Is it worth fixing?

I started with two blend door actuators clicking under the dash. I replaced both of those and they continued to click. I noticed that on at least one actuator it turns about four rotations before stopping. It only needs to turn a quarter turn, then stop. So I assume I have a different problem. I also now have a third actuator clicking as well.

The left side of my heater doesn't blow hot air but the right side does. The AC blows on both sides.
I have a cliking noise that runs for about 30 seconds after the car is shut off. I believe it might be the Air Door Actuator on the drivers side.

If so how do you replace it and where is it located at?

We own two of these cars. Both have experienced blend door actuator failures. I have changed two in mine and two in my wifes car. I am familiar with the fact that you must remove the "display" fuse before the change out and replace it when done, turn key to run and wait for the actuators to calibrate. You can hear them go through their cycles while calibrating. The PROBLEM: My wife's Impala had TWO actuators go out at the same time. The gear boxes are stripped. Something did not stop them when it should have. We have dual climate controls in both cars. The failed units are both on the passenger side. The recirc door and right side temp control are the ones affected. I replaced both and re-installed the fuse, turned the key to run and nothing happened. This time I did not hear the actuators go through the calibration. So I started the car and while watching the doors put them through their motions many times. No problems. Two days later the recirc door actuator is stripped again. The calibration process must go through a processor of some kind to count pulses or steps on the actuator servos and read resistance to know when to stop and position these controls. Could this be a body control module problem? One mechanic said it could just be the climate control module on the dashboard itself. But I don't think there is any computer processing ability on these controls. Just rotary switches and dials, etc. I have read that the BCM's do many functions and must be changed and programmed by the dealer. This is very expensive. Could this be a Body Control Module issue to have two actuators go at the same time?

Thank you very much! The fuse I pull is only labeled "Display". It powers the HVAC module along with other items. So I guess the dashboard control 'module' does have some 'processing' capabilities for calibration along with operation. And the cost of this module even at a discount suggests that this 'module' must be more than just switches. I will change out the hvac control module on the dashboard face and hope for the best.

When air control is selected to blow heated air to floor, most of the air blows from dash vents and vise versa.
When defrost is selected, most of the air (appx. 85%) blows from dash vents and very little air volume blows on windshield. I am forced to adjust selector to obtain quasi-acceptable defrost results. A real safety issue!
Additionally, there is a several (5-7) second delay when changing between air control selections. Previously, it was almost instantaneous.
What to check? Blend door actuator? Are there more than one? Electric or vacuum? Any and all help is greatly appreciated. Thanks!

Reinstall HVAC fuse with key "on" or "off"? Thanks.

Still somewhat confused. Is this the correct procedure;
1. Start car
2. Pull HVAC fuse.
3. Wait 60 seconds, leave car running
4. Reinstall fuse
5. Test controls to determine if reset occurred.

I cannot find a fuse labeled: "HVAC" in the schematic diagram of the fuse box.
Is it the Blower Motor Control Processor? BATT 4 Fuse 30A?
Or is it labeled something else?

WOW! It worked! Thank you so much!

In the pic you provided, is that view passenger side under dash looking directly through the glove compartment void and towards the middle of dash?

Although the process worked which resulted in re-calibration and now, when air control is set at floor, the fan blows on floor instead of thru the dash as well. YEA!

However there is still a noticeable pause, about 5 seconds when air control is changed from one setting to another. When the car was newer, I didn't notice this delay.

Could it be that the actuator (in the pic) is getting weak or is that "normal"?

Your thoughts?
Thanks, again