Where is the hvac mode door actuator motor located on a 2008 Buick Lucerne with auto air.

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2004 Buick Century A/C Heater Blend Door Actuator

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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 ...

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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

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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.
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Probably a problem with the HVAC blend door/actuator - imay be stuck in the cold air position.

There are 4 actuators: Recirculation, left side, right side, mode door. One of the air temp actuators isn't working on your vehicle.

First, check coolant level. If it's low, it'll blow cool air. Second, check the fuse for the HVAC system. The mode door actuator and mode door controls WHERE the air comes out and the BLEND door actuator and blend door controls the air temperature. So do a search for the locations of those items on your car and check their operation.

Air Distribution
The HVAC control module controls the distribution of air by the use of a defrost actuator and a mode actuator. The modes that may be selected are:
?€¢
Defrost

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Defog

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Panel

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Bi-Level

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Floor

The mode and defrost actuators are connected to the mode and defrost doors by a cam type linkage system. Depending on the position of the door, air is directed through the HVAC module and distributed through various ducts leading to the outlets in the dash. If the HVAC control module detects a fault with the mode or defrost doors the HVAC control module will try to drive the actuator for a predetermined amount of time, to defrost, which is the defaulted position for the mode and defrost door actuators. When the mode switch is placed in the defrost or defog positions the A/C is commanded on and the recirculation door is moved to the outside air position to help reduce window fogging. A/C is available in all modes and recirculation is only available in the panel and bi-level modes.
Circuit Description The following DTCs are for the HVAC door actuators: ?€¢
B0248 is for the defrost actuator.
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B0263 is for the mode actuator.
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B0408 is for the left air temperature actuator.
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B0418 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 logic circuit inside the actuators receives control signals from the HVAC control module and controls the internal stepper motor. When a door positional change is required, the HVAC control module calculates a commanded door position. The module compares the commanded door position to the actual door position and determines the needed direction of motor rotation. The module applies a signal voltage to the door control circuit that is an input to the internal logic circuit of the door actuator. A 5 volt signal increases the door position. A 0 volt signal decreases the door position. When the commanded door position is equal to the actual door position, the HVAC control module sends a 2.5 volt signal to the door actuator and motor rotation stops. The ignition 3 voltage circuit provides source voltage to the logic circuit. The module provides ground to the actuator logic circuit through the low reference circuit. I would start by having the HVAC control module checked for DTC'S -diagnostic trouble codes First . Then check the system by using scan tool data . 1
Did you perform the HVAC Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - HVAC Systems - Manual

2

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, command the appropriate HVAC door actuator ON and OFF while observing the corresponding Door Actual parameter.

Does the scan tool indicate that the value of the appropriate Door Actual parameter changes?
Go to Diagnostic Aids
Go to Step 3

I would

There is a little motor on the heater box under the dash that needs to be replaced. It's called a blend door actuator...

NOTE: LHD model shown. RHD model similar. All vehicles are equipped with a common heater, ventilation and air conditioning (HVAC) housing assembly (1). The heating-A/C system combines A/C, heating, and ventilating capabilities in a single HVAC housing mounted within the passenger compartment behind the instrument panel. The HVAC housing assembly includes:

1. Mode-air doors (2)
2. A/C evaporator (3)
3. Recirculation door actuator (4)
4. Air inlet housing (5)
5. Recirculation-air door (6)
6. Blower motor (7)
7. Blower motor resistor (8)
8. Heater core (9)
9. Air distribution housing (10)
10. Blend-air door (11)
11. Blend door actuator (12
12. Floor distribution ducts (13)
13. Mode door actuator (14)

The mode door actuators are reversible, 12-volt direct current (DC) servo motors. The heating-A/C systems on this vehicle use two mode door actuators. One for the panel/floor-air door and one for the defrost-air door.

Both the defrost door actuator (1) and the panel/floor door actuator (2) and the are located on the driver side end of the HVAC housing (3), close to the dash panel.

All actuators (1) are interchangeable with each other. Each actuator is contained within an identical black molded plastic housing with an integral wire connector receptacle (2). Each actuator also has an identical output shaft with splines (3) that connects it to its respective door linkage and three integral mounting tabs (4) that allow the actuator to be secured to the HVAC housing. The mode door actuators do not require mechanical indexing to the mode-air doors, as they are electronically calibrated by the A/C-heater control.
OPERATION

The mode door actuators are connected to the A/C-heater control through the vehicle electrical system by dedicated two-wire leads and connectors of the HVAC wire harness. The mode door actuators can move the defrost-air door and the panel/floor-air door in two directions. When the A/C-heater control pulls the voltage on one side of the motor connection high and the other connection low, the mode-air door will move in one direction. When the A/C-heater control reverses the polarity of the voltage to the motor, the mode-air door moves in the opposite direction.

When the A/C-heater control makes the voltage to both connections high or both connections low, the mode-air door stops and will not move. The A/C-heater control uses a pulse-count positioning system to monitor the operation and relative position of the mode door actuators and the mode-air doors. The A/C-heater control learns the mode-air door stop positions during the Actuator Calibration procedure and will store a Diagnostic Trouble Code (DTC) for any problems it detects in the mode door actuator circuits.

The mode door actuators are diagnosed using a scan tool (Refer to 28 - DTC-Based Diagnostics/HVAC - Diagnosis and Testing).

The mode door actuators cannot be adjusted or repaired and must be replaced if inoperative or damaged.

Your parts outlet, especially the dealer parts counter will be able to print a diagram of the location of the mode actuator. It's definitely in the dash. Some are a lot easier to change than others.

Do you have dual zone cooling? If so, you have a bad air blend motor. I had to replace 3 on my 07 Impala and the basic geography of the part locations are the same for your Lucerne. There is one to the left of the radio well back into the dash, one to the right and one by the passenger side kick panel, near the door hinge. They are not for the faint of heart to replace. I had to replace mine because they were clicking and sounding obscene. They run about $25 each. Determine which is faulty using this rule of thumb:
Drivers side uncontrollable: replace far left blend motor
Passenger side uncontrollable: replace one just to the left of the glove box.
If you cannot switch between outside air and recirc, replace the one to the right of the glove box.
The blend control motors look eerily similar to a quartz clock movement you'd find in a hobby store, however, that is where the similarity ends.

Hope this helps