Air blend door

Replacing the air blend door actuator (commonly known as the air blender) on a 2005 Lincoln Aviator is a moderately challenging task that requires some mechanical know-how and the right tools. The air blend door actuator is responsible for controlling the temperature of the air that comes out of the HVAC system by adjusting the position of the blend door. If you're confident in your abilities, follow these general steps to replace the actuator:
Note: Before starting any work, ensure the vehicle is turned off and the battery is disconnected to avoid electrical hazards.
Tools and Materials Needed:

• Screwdrivers (Phillips and flat-head)
• Socket and ratchet set
• Trim panel removal tool (optional)
• New air blend door actuator
• Shop manual or repair guide for your specific vehicle (for reference)

Step-by-Step Guide:

1. Locate the Actuator: The air blend door actuator is usually located behind the dashboard, in the HVAC housing. Access to it may require removing some interior panels and components, so consult your vehicle's repair guide for specific instructions on gaining access to the actuator.
2. Disconnect the Battery: As a safety precaution, disconnect the negative terminal of the battery to avoid electrical mishaps while working on the vehicle.
3. Remove Interior Panels: Depending on the location of the actuator, you may need to remove portions of the dashboard or other interior panels to access it. Use a trim panel removal tool or a flat-head screwdriver wrapped in cloth to avoid damaging the panels.
4. Disconnect Wiring Harness: Once you have access to the actuator, locate the wiring harness connected to it. Gently disconnect the wiring harness by pressing the release tab and pulling it away from the actuator.
5. Remove Actuator Mounting Screws: The actuator is usually secured to the HVAC housing with screws. Use a socket and ratchet or a screwdriver to remove these screws and detach the actuator from the housing.
6. Install the New Actuator: Position the new air blend door actuator in place and secure it with the mounting screws. Make sure it is properly aligned with the blend door and HVAC housing.
7. Reconnect Wiring Harness: Attach the wiring harness back to the new actuator, ensuring a secure connection.
8. Test the Actuator: Reconnect the negative battery terminal and turn on the vehicle. Test the new actuator by adjusting the temperature controls and checking if the blend door moves accordingly.
9. Reassemble Interior Panels: Once the actuator is functioning correctly, reassemble any interior panels or components you removed earlier.
10. Test the HVAC System: After reassembly, test the entire HVAC system to ensure everything is working correctly. Check for any unusual noises or issues with temperature control.

Always follow safety precautions and consult your vehicle's repair manual for specific instructions and diagrams related to your Lincoln Aviator's model year. If you are unsure or uncomfortable performing this task, it is best to seek assistance from a professional mechanic.

topic cars and HVAC heat lost.
the heater blower resistor is bad.
or controls to it bad.
the vent problem is bad vent actuators or controls to them.
see hvac here

https://eautorepair.net/Marketing/Default.asp

Blend Door Actuator Servos not working or Blend Doors off their mountings.

it's not a valve it's a blend door or blend door actuator under the dash that switches the way the air is handled in your vehicle. I would start by removing the fan motor in the passenger side foot well and make sure the fan is clear of all debris. then you should be able to switch cold to hot on the dash and hear a door change the direction of the air inside the box in your dash. if that blend door is not working properly then you will need to see if there is a blend door actuator http://www.youtube.com/watch?v=AKA3LLFreTw

Cabin air filter? Blower motor working on all speeds? Critters building nest in heater box

There is blend door in vent channels under the dash of the vehicle. It blends warm and cool air in the vents depending on the temperature setting. The Blend Door is controlled by a motor called an actuator that gets its signals from the setting on the dash. When the actuator fails the blend door can't move. If it stops on hot you always get hot air.
3 possibilitys
1. Blend Door stuck.
2. Temperature control not sending signal to actuator.
3. Actuator motor gone bad.

Of the 3 possibilities the actuator motor is the most common and the easiest to fix. The part is $40-90. I don't know exactly where actuator is on the Pilot. My GMC you remove the plastic trim below the dash and its just to the left of the glove box near the 'hump'. Perhaps the part store can tell you or someone else will offer the exact location.

Once you remove the actuator you can plug it back in to the wire clip and move the temperature knob and see if it moves. When you get the new one plug it in and make sure it turns before bolting it in.

To clarify a bit. The heater is never technically turned off. The blend door determines how much it goes thru the vents.

To the Chevy Trailblazer....The HVAC system on your vehicle has small blend doors (About 4 by 3 in.) in size ...these doors will sometimes stick or the plastic rod hinge that it rotates on will break and it will not redirect the air flow..You could double check connection at the switch and for spot wear...sometimes it
also be the ( BLEND DOOR MOTOR/ACTUATOR ) This is what opens and closes the doors..It is very important to know the exact problem...To save money BEST thing to do is take to a dealer and tell them to scan your HVAC system and describe what I have stated...The dealer TECH 2 scanner will tell you exactly where the problem is...I worked for GM 2 yrs. I have changed blend doors before, sometimes you have to remove dash and that would cost very much so it is best to know exactly where problem lies....It could be the motor or switch which would be a little cheaper.....I hope this helps .Metalpoet

You may have a bad temperature door actuator motor on the drivers side. The actuator is what moves the temperature blend door and when it fails it usually moves the door all the way to the "hot" position. Sometimes if you shut the vehicle off for a bit then restart it the system will work fine for a while then the actuator will again swing the door all the way open or shut. I've replaced several of these actuators [both drivers side and passenger side] for similar problems.

If your vehicle has dual climate control settings then you may have a failing temperature blend door actuator motor on the drivers side. These actuators move the temperature door to match the settings selected at the controls on the dash but sometimes don't feed back the proper information to the controler and the result is that the door will move too far one way or the other giving you too much hot or cold air. When you shut off the vehicle for a few moments and restart it the system cycles the doors and figures out where everything is and it will work for a while until the feedback signal is lost again.

I would look at the air blend doors first, it sound like they are not working or your control in the dash is not working send a signal to them. they work by changing the air from hot to cold or in between.

Avalanche, Sierra And Silverado

1. Remove the floor air outlet duct extension (1) from the floor duct (2). Remove the floor air outlet duct extension (1) from the floor duct (2)
2. Disconnect the electrical connection at the blend door actuator (10). Blend door actuator and related components
3. Remove the blend door actuator mounting screws from the HVAC module.
4. Remove the blend door actuator as an assembly with the actuator cam. Remove the blend door actuator mounting screws from the HVAC module

To install:

1. Install the blend door actuator as an assembly with the actuator cam.
   1. Line up the heater/defroster valve lever with the blend door actuator cam slot.
   2. Line up the A/C valve lever with the blend door actuator cam
2. Install the blend door actuator mounting screw to the HVAC module.
   1. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm).
3. Connect the electrical connection at the blend door actuator (10). Blend door actuator and related components
4. Install the floor air outlet duct extension (1) to the floor air duct (2).

C/K Series

1. Disconnect the electrical connector to the mode actuator that is located on the left side of the air distribution case.
2. Remove the screws.
3. Remove the adjuster links from the control lever.
4. Remove the mode actuator.
5. Adjust the mode actuator by completing the following steps:
   1. Connect the electrical connector to the actuator.
   2. Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
   3. Turn the ignition switch to the OFF position.
   4. Remove the actuator from the electrical connection. Blend door actuator-C/K Series

To install:

1. Install the mode actuator.
2. Install the screws.
3. Install the adjuster links to the control lever.
4. Connect the electrical connector.
5. Test the circuit operation