IMAC ACTUATOR REPLACEMENT

Question edited for clarity.

They all work to a similar theme. The Buick LeSabre will be close enough.

https://www.google.com/search?q=1990+Buick+Reatta.+How+to+replace+a+power+door+lock+actuator

1990 Buick Reatta Door Lock Actuator - VDO AC89312

https://www.stockwiseauto.com > ... > Door Lock Actuator
Feb 4, 2021 - Replacing the Door Lock Actuator on your 1990 Buick Reatta? The VDO AC89312 is a genuine replacement, with the fit of an Original Equipment ...
Rating: 5 · ‎1 review

Get the Best Priced Buick Reatta Door Lock Actuator - Parts ...

https://www.partsgeek.com > mmparts > buick > reatta
This part is also sometimes called Buick Reatta Power Door Actuator. We stock door lock ... Replacement Door Lock Actuator - for 1990 Buick Reatta - 839-008 ...

Heat actuator, do you mean the blend door actuator.

Code B0428 is for the rear temp actuator.
Code B3532 is for the rear mode actuator for the HVAC unit

our honda crv did this , there was a problem with the heater core being partially pluged...there ended up being a recall on heater core

How To Install Replace AC Heater Temperature Actuator ...

? 4:40
https://www.youtube.com/watch?v=mVP09M7hLB4
Jul 21, 2014 - Uploaded by 1A Auto Parts
http://www.1aauto.com/temperature-blend-door-actuator/i/ ... To Install Replace AC Heater Temperature Actuator 2000-05 ChevyMonte Carlo.

2006 Monte Carlo: Blend Door Actuator Replacement ...

? 2:19
https://www.youtube.com/watch?v=_B17o-Ljhfs
Mar 31, 2015 - Uploaded by Adam Strojny
In this video I will show you guys how to replace the actuators behind the glove compartment that where causing ...

Chevy Blend Door Actuator Replacement - Part 3 - YouTube

? 12:26
https://www.youtube.com/watch?v=1q9ugwlqDoo
May 14, 2013 - Uploaded by Dan Abbott
My final step to replacing the blend door actuator. ... Thanks for the video, need to do this on my 04 monte carlo ss, went to use the heat today .... 2003 Chevy Suburban AC-heater air direction problem.mov - Duration: 1:36. by ...

Check the ground to the actuator, if that is ok replace the actuator.

#04-01-38-002A: Clicking Noise From Instrument Panel After Vehicle is Started (Replace Mode Valve Actuator Assembly Using Special Tool GE-47676) - SUPERSEDED BY BULLETIN 05-01-38-001A - (Oct 21, 2005) Mode Valve Actuator Replacement Tools RequiredGE-47676 Mode Actuator Removal Tool
Removal Procedure

1. Remove the left floor duct. Refer to Floor Air Outlet Duct Replacement - Left Side .
Important: The service actuator is positioned in the bi-level mode. Place the mode door in the middle of the door's travel.

2. Disconnect the mode actuator electrical connector.
3. Remove the mode actuator mounting screws.
4. Using GE-47676 remove the mode actuator.

Installation Procedure

1. Install the mode actuator.
Notice: Refer to Fastener Notice in the Preface section.

2. Install the mode actuator mounting screws.
Tighten
Tighten the screws to 1.9 N·m (17 lb in).

3. Connect the mode actuator electrical connector.
4. Install the left floor duct. Refer to Floor Air Outlet Duct Replacement - Left Side .

Hello: I have bad news for you, if you run the actuator without it connected to the door the actuator is ruined, it will have to be replaced. After replacement the system has to have the doors (actuators re-calibrated.) re-calibrated. This is done with a Tech 2, A GM special tool.

Air Door Actuators Removal & Installation Air Temperature Actuator Air Temperature Actuator Replacement

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.

1. Remove the instrument panel hush panel.
2. Disconnect the connector from the air temperature actuator.
3. Remove the air temperature actuator mounting screws.
4. Remove the actuator from the HVAC assembly.

To Install:

1. Position the air temperature actuator on the HVAC assembly.
2. Install the actuator mounting screws.
3. Install the electrical connect to the air temperature actuator.
4. Install the instrument panel hush panel.

Right Side Air Temperature Actuator (2003-2007) Right Air Temperature Actuator Replacement

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.

1. Remove the instrument panel carrier.
2. Disconnect the connector from the right air temperature actuator.
3. Remove the actuator mounting screws.
4. Remove the right air temperature actuator.

To Install:

1. Position the right air temperature actuator on the HVAC assembly.
2. Install the actuator mounting screws.
3. Connect the electrical connector to the actuator.
4. Install the I/P carrier.
5. Calibrate the actuator.

Left Side Air Temperature Actuator (2003-2007) Left Air Temperature Actuator Replacement

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.

1. Remove the I/P insulator panel.
2. Disconnect the connector from the left air temperature actuator.
3. Remove the actuator mounting screws.
4. Remove the left air temperature actuator.

To Install:

1. Position the left air temperature actuator on the HVAC assembly.
2. Install the actuator mounting screws.
3. Connect the electrical connector to the actuator.
4. Install the I/P insulator panel.
5. Calibrate the actuator.

Mode Actuator Mode Actuator Replacement

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.

1. Remove the floor air outlet from the floor duct.
2. Remove the center console and center console duct (if equipped).
3. Disconnect the electrical connection at the mode actuator.
4. Remove the mode actuator mounting screws from the HVAC module.
5. Remove the mode actuator with the actuator cam attached.

To Install:

1. Position the mode actuator with the actuator cam to the HVAC module.
   • Align the heater/defroster valve lever with the cam slot
   • Align the A/C valve lever with the cam
2. Install the mode actuator mounting screws.
3. Connect the mode actuator electrical connection.
4. Install the center console duct and the center console (if equipped).
5. Install the floor air outlet duct extension to the floor air duct.
6. Calibrate the actuator.

Air Inlet Actuator/Recirculation Actuator Delphi Recirculation Actuator Replacement (Delphi)

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.

1. Remove the instrument panel upper trim panel.
2. Remove the instrument panel lower trim panel and glove box assembly.
3. Remove the passenger side air bag.
4. Disconnect the connector from the recirculation actuator.
5. Remove the recirculation actuator mounting screws.
6. Remove the recirculation actuator from the HVAC assembly.

To Install:

1. Position the recirculation actuator on the HVAC assembly.
2. Install the recirculation actuator mounting screws.
3. Connect the electrical connector to the recirculation actuator.
4. Install the passenger side air bag.
5. Install the instrument panel lower trim panel and the glove box assembly.
6. Install the instrument panel upper trim panel.
7. Calibrate the actuator.

Visteon Recirculation Actuator Replacement (Visteon)

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.

1. Remove the HVAC module assembly.
2. Remove the evaporator core cover from the HVAC module.
3. Remove the recirculation actuator from the HVAC module assembly.

To Install:

1. Position the recirculation actuator on the HVAC assembly.
2. Install the recirculation actuator mounting screws.
3. Install the evaporator core cover to the HVAC module.
4. Install the HVAC module assembly.
5. Calibrate the actuator.

First, what is the problem that you need to replace the actuator? Is the air flow from the vents not changing? If this is the problem, the actuator is inside the venting behind the control panel and is difficult to get to but is possible. Follow the hoses on back of temp controls to the actuator. There should be 2 small bolt screws to remove to change out actuator.
If this is for something else, let me know