Where can you buy a buick air ACTUATOR MOTOR

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2004 Buick Century A/C Heater Blend Door Actuator

AutoZone https://www.autozone.com > buick > century > 2004

Dorman HVAC Door Actuator 604-107 · Part # 604-107 · SKU # 575021 · limited lifetime warranty Limited-Lifetime Warranty · 4.8. (17). 4.8 out of 5 stars. 17 ...

NOS 2004 BUICK CENTURY HEATER BLEND DOOR ...

eBay https://www.ebay.ca > ... > HVAC Vent Actuators

NOS 2004 BUICK CENTURY HEATER BLEND DOOR ACTUATOR 52404369 HVAC ; Breathe easy. Returns accepted. ; Fast and reliable. Ships from United States. ; Condition. New ...

Buick Century for HVAC Vent Actuators for 2004

eBay https://www.ebay.ca > ... > HVAC Vent Actuators
Dorman 604-107 HVAC Air Door Actuator fits Buick Century · C $42.80 ; 2 Heat Heater A/C Fan Air Vent Blend Door Actuator for Chevy GMC Pickup 15-72971 · C $46.84 ...

2004-2005 Buick Century Air Flap Actuator - DIY Solutions ...

Parts Geek https://www.partsgeek.com > Buick Parts > Century Parts
HVAC Heater Blend Door Actuator Set 2 Piece Set - 2004-2005 Buick Century - DIY Solutions 17810-02555053. Review Fitment Notes. Part Number: 17810-02555053.
US$47.95

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On the HVAC case under the dash on the passenger side, along with the air mix door/actuator - one of the least user friendly locations. YouTube may have some help for you.

Do you have manual or automatic ? It's probably the Air Temperature Actuator - It's an electric motor inside the heater/A/C unit that controls a door that diverts air over the heater core or A/C evaporator . The HVAC - heating , ventilation , air con ,control module has the capability to set an store DTC'S - diagnostic trouble codes . Could have one or two of those stored in the control module . You would need to take your vehicle to the dealer or some other qualified repair shop that has diagnostic scanner that can check for these type codes . These codes will not turn the check engine light .on. Different system .
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B0414 is for the left air temperature actuator.

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B0424 is for the right air temperature actuator.

The HVAC control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of a stepper motor, a logic circuit, and a potentiometer. The potentiometer inside the door actuator allows the module to monitor the current position of the actuator drive shaft. The module supplies a 5 volt source voltage to the potentiometer on the 5 volt reference circuit. The module supplies ground to the potentiometer through the low reference circuit. The HVAC control module monitors the voltage drop across the potentiometer on the door position signal circuit. When the actuator shaft rotates, the voltage on the door position signal circuit changes. The module converts the voltage value to a count value where 1 volt is approximately equal to 51 counts.
The HVAC control module calibrates the travel range of the HVAC door actuators when it is initially powered by the battery positive voltage circuit. During calibration, the module commands the actuators in each direction until door travel is stopped. The module stores the minimum door positions and the maximum door positions of each actuator into memory. The total travel range is calculated by subtracting the minimum door position from the maximum door position. The door actuators can be calibrated again with a scan tool.
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B0408 is for the left air temperature actuator.

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B0418 is for the right air temperature actuator.

Your best bet is to take to a repair shop , the dash (instrument panel ) has to be taken out ( apart) .

The vacuum motor may be bad:

Vacuum Actuators Fig. 1: Vacuum actuators and related parts
REMOVAL & INSTALLATION

1. Refer to the Air Bag section at the beginning of this Section, and disarm the Air Bag system. Disconnect the negative battery cable.
2. Remove the glove box assembly.
3. Remove the right and left side sound insulators.
4. Remove the heater ductwork.
5. Disconnect the hose harness from the actuator.
6. Disconnect the actuator rod or lever.
7. Remove the mode, recirc, or A/C-defrost actuator. To install:
   
8. Install the actuator.
9. Connect the actuator rod or lever.
10. Connect the hose harness to the actuator and fully seat.
11. Install the heater ductwork.
12. Install the right and left side sound insulators.
13. Install the glove box assembly.
14. Refer to the Air Bag section at the beginning of this Section, and arm the Air Bag system.

It can be low on freon,or,the actuator motor foor that side blend door is bad,if so,the dash has to be removed to replace the actuator motor.

There is a blend door actuator motor that is not working,the dash has to be removed back toward the seats to access the actuator motor.

The blend motor to go from cold to hot is located on the blower motor housing. They are usually mounted close to the blower motor.

Actuator motors either get a tear in the rubber or a hose is broken and not letting vacuum assist in its opening.
You can try moving the lever by hand and see if the air gets colder on the bad side.

you can remove radio to get to them.disable air bags when working around dash.

U need to replace the air temperature control blend door actuator motor, this requires removing the dash to access the motor for the blend door.