What is the correct recalibration process after replacing the blend door actuator?

Here is the procedure as outlined in one of our shop manuals.
Disconnecting the negative post of the battery will make sure all power is disconnected from the module without pulling fuses.

The HVAC control module will relearn the actuator limits whenever power is disconnected and re-connected to the module.

Use the following steps to perform the calibration update:
1. Turn off the ignition.
2. Remove the battery positive voltage circuit fuse of the HVAC Control Module.

IMPORTANT:
- The scan tool must be disconnected from the vehicle to properly perform the calibration procedure. If a scan tool is connected before this procedure is completed, then new calibration values will not be stored.
- Failure to wait 60 seconds will not allow the HVAC control module sufficient time to clear the old calibration values.
3. Wait 60 seconds.
4. Install the fuse.
5. Turn on the ignition.
6. Wait 60 seconds before installing a scan tool.

Based on what you have said, this makes me think the the HVAC control head may be damaged. Does your scan tool report the position of the mode door?

As far as I know, a scan tool basically will see what a module sees. Any output state tests commanded from the scan tool are carried out in whatever module you're testing. So, I think I'm going to need some more information.

First off, which type of HVAC are we working on? Manual or Auto and does it have dual zone or not?

Secondly, could you please describe the concern you are having: no temperature change at all, noises, etc.

I really want to help get this figured out. Thanks in advance.

Thank you for that info. It's possible you may have a faulty actuator or even a damaged blend door. But first, I think we should do a little circuit testing. There may be an issue in the circuit that reports motor position.
First, let's make sure we have a good 5.0v reference voltage at the actuator. I marked that circuit in red on the schematic and pinout. With the actuator connector unplugged, turn the ignition on. Then check voltage between pin 10 and ground. You should get about 5.0 volts.
Second, test the ground circuit, marked in purple. From pin 7 to ground, the resistance should be less than 10 ohms.
If both of those circuits test good, let's make sure the position signal circuit is ok. You will need to disconnect the plug from the HVAC module for this one. Test resistance from pin 9 of the actuator connector to pin C4 (marked in yellow) of the HVAC connector. A good reading will be less than 10 ohms.

If all the circuit tests prove to be good, I would remove the blend air motor and then try to operate the blend air door manually. Make sure it moves freely through the full range. Please let me know how it goes.

My apologies, I have always known the blend door to be the temperature door. I'm out of town now, but I was able to see that the mode door and the temperature door are two different part numbers. Is it possible you were given the wrong part?

I will be back home tomorrow evening, and I could get access to more information as needed. Thanks, and I apologize again for my confusion.

Thank you, I hope you had a happy 4th! I posted a parts diagram that lists 3 and 19 as temperature actuators and 14 as the mode door actuator. My catalog lists the mode door as GM p/n 52473356 and the blend air actuator as p/n 52474810. I did an image search, and they look very similar. So, I would like to verify that the correct part number was installed. That's the only other thing I can think of at this time.

I came across this video that I think perfectly describes your issue. It's a bit long, but if you jump to about the 20-minute mark I think you will agree.

https://youtu.be/_jTN0X2TYvU

So, I think you fixed it, unless you want to replace the mode doors or the entire HVAC assembly. Let me know what you think.