How to determine what needs replaced next?

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.

1. Locate the blend door actuator. The actuator is located behind the dashboard, usually on the passenger side. It is a small, rectangular motor with a wiring harness and a linkage arm.
2. Disconnect the battery. Before beginning any work on the electrical system, disconnect the battery to avoid any electrical shorts or other accidents.
3. Remove the dashboard panel. In order to access the blend door actuator, the dashboard panel may need to be removed. Consult the vehicle's repair manual for specific instructions on how to remove the panel.
4. Remove the old blend door actuator. Disconnect the wiring harness and the linkage arm from the old blend door actuator. Remove any mounting screws or bolts that secure the actuator to the dashboard.
5. Install the new blend door actuator. Install the new blend door actuator in the same location as the old actuator. Secure the actuator with any mounting screws or bolts. Connect the wiring harness and the linkage arm to the new actuator.

Right side or left ? Electronic Automatic Temperature Control or manual ? Temperature or mode door ?
Temperature Blend Door Actuator - LH Removal and Installation
NOTE: It is not required to install the new LH temperature blend door linkage parts included in the LH temperature blend door actuator service part kit if only the temperature blend door actuator requires replacement and the linkage parts are not broken or binding.
LH temperature blend door actuator and linkage

1. Remove the 2 lower steering column opening cover bolts.

1. Detach the lower steering column opening cover.

1. Disconnect the in-vehicle temperature sensor aspirator hose and electrical connector.

1. Position the instrument panel wire harness away from the LH temperature blend door actuator.

1. Remove the 3 LH temperature blend door actuator screws.

1. Disconnect the LH temperature blend door actuator electrical connector.

1. Remove the LH temperature blend door actuator.

1. Manually operate, and inspect the LH temperature blend door linkage for incorrect placement, binding or damage.

Temperature Blend Door Actuator - RH, Dual-Zone EATC Removal and Installation
NOTE: It is not required to install the new RH temperature blend door linkage parts included in the RH temperature blend door actuator service part kit if only the temperature blend door actuator requires replacement and the linkage parts are not broken or binding.
RH temperature blend door actuator and linkage

1. Disconnect the glove compartment damper from the glove compartment.

1. Remove the glove compartment.

1. Remove the RH lower instrument panel insulator.

1. Remove the RH lower floor console trim panel.

1. Remove the 3 RH temperature blend door actuator screws.

1. Disconnect the RH temperature blend door actuator electrical connector.

1. Remove the RH temperature blend door actuator.

1. Manually operate, and inspect the RH temperature blend door linkage for incorrect placement, binding or damage.
2. Mode Door Actuator - Defrost/Panel/Floor Door
3. Removal and Installation
   NOTE: The defrost/panel/floor mode door actuator can be accessed from below the driver side of the instrument panel.
   NOTE: It is not required to install the new defrost/panel/floor mode door linkage parts included in the defrost/panel/floor mode door actuator service part kit if only the mode door actuator requires replacement and the linkage parts are not broken or binding.
   Mode door actuator and linkage
   1. Remove the 3 defrost/panel/floor mode door actuator screws.
   1. Disconnect the defrost/panel/floor mode door actuator electrical connector.
   1. Remove the defrost/panel/floor mode door actuator.
   1. Manually operate, and inspect the defrost/panel/floor mode door linkage for incorrect placement or damage.
   Mode door actuator linkage only
   
   1. Remove the mode door linkage.
      1. Depress the tab and remove the panel door lever.
      1. Remove the floor/defrost door intermediate lever screw and floor/defrost door intermediate lever.
      1. Pull straight outward to remove the floor/defrost door lever.
   Mode door actuator and linkage
   
   1. NOTE: When installing the mode door actuator, make sure that the panel door lever and floor/defrost intermediate lever are correctly aligned with the mode door actuator cam.
      To install, reverse the removal procedure.

first, check under te hood to see if the heater core water hoses are hot going in and coming out. If hot going in but cold coming out, water valve (if you have one) may not be working.
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Control System Outputs
The air management doors are controlled by vacuum control motors (18A318) and an A/C electronic door actuator motor (19E616). The air inlet and distribution doors are controlled by vacuum control motors. The temperature blend door is controlled by the A/C electronic door actuator motor.
The A/C electronic door actuator motor provides a variable number of temperature blend door positions. Temperature control position energizes the A/C electronic door actuator motor moving the temperature blend door.
Vacuum control motors are used on both air distribution and air inlet doors. The air inlet and panel/defrost doors use a two position vacuum control motor. The floor duct/panel door uses a three position vacuum control motor. Vacuum control motors are controlled by engine vacuum through the climate control head.
For more information on the control components Section 412-04 .
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Air Management Doors
The air management doors are controlled by vacuum control motors (18A318) and an A/C electronic door actuator motor (19E616). The air inlet and distribution doors are controlled by a vacuum control motor. The temperature blend door is controlled by the A/C electronic door actuator motor.
The A/C electronic door actuator motor provides a variable number of temperature blend door positions. Temperature control position energizes the A/C electronic door actuator motor moving the temperature blend door.
Vacuum control motors are used on both air distribution and air inlet doors. The air inlet and panel/defrost doors use a two position vacuum control motor. The floor duct/panel door uses a three position vacuum control motor. Vacuum control motors are controlled by engine vacuum through the climate control head.
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Section 412-04: Control Components - Climate Control 1997 F-150, F-250 Workshop Manual
REMOVAL AND INSTALLATION A/C Electronic Actuator
Removal

1. Remove the floor duct panel.
   • Remove the two plastic push pins (one each side) and release the expander clip.

1. Remove the RH instrument panel brace.
   1. Remove the lower nut.
   1. Remove the upper bolt.
   1. Remove the brace.

1. Remove the LH instrument panel lower nut and position brace out of the way.

1. Disconnect the vacuum harness from the vacuum actuator.

1. Remove the floor duct.
   1. Remove the two screws (one each side).
   1. Remove the floor duct.

1. Remove the panel/floor door vacuum control motor.
   1. Disconnect the vacuum line connector.
   1. Remove the two panel/floor door vacuum control motor screws.
   1. Slide the rod out of the door and remove the panel/floor door vacuum control motor.

1. Remove the electronic actuator.
   1. Disconnect the electrical connector.
   1. Remove the three screws.
   1. Pull down to release the actuator shaft and remove the electronic actuator.

Sounds like the blend door actuator. It separates the driver and passenger side from getting air on the AZC system. Here are some instructions on replacing it:
The passenger side blend door actuator is used on all models equipped with Automatic Zone Control (AZC). This actuator is located on the front of the HVAC housing to the right of the floor panel transmission tunnel and cannot be removed from the passenger compartment without instrument panel or HVAC housing removal.

NOTE: This procedure is for AZC Systems (Passenger side only).

1. Disconnect and isolate the battery negative cable.
2. Remove the glove box door. See: Body and Frame\Interior Moulding / Trim
3. Remove the lower I/P glove box door surround panel.
4. Remove the dash assembly. See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel Assembly
5. Remove the HVAC assembly. See: Housing Assembly HVAC\Service and Repair
6. Unplug the wire harness connector from the blend door actuator.
7. Remove the 2 screws that secure the blend door actuator to the HVAC housing.
8. Remove the blend door actuator from the HVAC housing.

INSTALLATION - AZC (Passenger side only)

1. In stall the blend door actuator on the HVAC housing and tighten the two mounting screws to 2.2 Nm (20 in. lbs.).
2. Plug in the wire harness connector to the blend door actuator.
3. In stall the HVAC unit into the vehicle. See: Housing Assembly HVAC\Service and Repair
4. Install the instrument panel assembly into the vehicle. See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel Assembly
5. Evacuate the HVAC system.
6. Recharge the HVAC system.
7. Connect and the battery negative cable.

Hope it helps! If you need more, just send me an email at familyguy77351 at yah I wil be glad to finish helping you with more detail.

Are the 2 tubes that go to the heater core getting hot? If so, then the blend door is not opening to allow heat to get to the cabin.

Possible vacuum motor problem, either disconnected, or the controller for the blend door is broken is likely problem.

Troubleshooting by Symptom Poor Heater System Performance CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.

1. Start the engine.
2. Idle the engine until the thermostat opens (upper radiator hose will be hot) Is the engine at normal operating temperature (approx. 200° F)? If yes, go to the next step. If no, go to step 16.
3. Set the mode selector to FLOOR mode.
4. Set the heater control selector to the warmest temperature setting.
5. Set the blower speed the lowest setting.
6. Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 14. If no, go to the next step.
7. Set the mode selector to PANEL mode.
8. Select the maximum blower speed.
9. Select the warmest temperature setting.
10. Place a thermometer into the center I/P PANEL air outlet and affix a second thermometer to the heater core outlet heater hose.
11. Record the temperature at the center I/P PANEL air outlet and at the heater core outlet heater hose. Are the two temperature readings about equal? If yes, go to the next step. If no, go to step 13.
12. Inspect and repair the cowl, cowl area, recirculation door, and the HVAC evaporator/heater core case for cold air leaks. Repair any problems found, go to step 17.
13. Inspect the temperature door operation. Repair any problems found, go to step 17.
14. Turn OFF the engine. Back-flush the heater core. Start the engine. Select the FLOOR mode and the lowest blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Is the inlet heater hose feel significantly hotter than the outlet heater hose? If yes, go to the next step. If no, go to step 17.
15. Replace the heater core. When the repair is completed, go to step 17.
16. Check for low engine temperature problems, Repair or replace as needed, go to step 17.
17. Operate the system in order to verify the repair. If the system operates properly, the repair is complete. If the heater still does not work properly, repeat the entire procedure.

Air Door Actuators/Motors Removal & Installation Recirculation Actuator To Remove:

1. Remove the right lower instrument panel (I/P) insulator.
2. Remove the glove box assembly. Recirculation actuator (Typical)
   
   
3. Remove the mounting screws and recirculation actuator from the HVAC module assembly.
4. Disconnect the recirculation actuator harness connector.

To Install:

1. Align the recirculation actuator slots with the flats on the actuator door shaft.
2. Install and secure the recirculation actuator on the HVAC module assembly with the mounting screws.
3. Connect the recirculation actuator harness connector.
4. Install the glove box assembly.
5. Install the right lower I/P insulator.
6. Calibrate the recirculation actuator.

Mode Actuator To Remove:

1. Remove the right lower instrument panel (I/P) insulator.
2. Remove the glove box assembly. Mode actuator
   
   
3. Remove the mounting screws and mode actuator from the HVAC module assembly.
4. Disconnect the mode actuator harness connector.

To Install:

1. Align the mode actuator slots with the flats on the actuator door shaft.
2. Install and secure the mode actuator on the HVAC module assembly with the mounting screws.
3. Connect the mode actuator harness connector.
4. Install the glove box assembly.
5. Install the right lower I/P insulator.
6. Calibrate the mode actuator.

Air Temperature Actuator Right Side To Remove:

1. Remove the right lower instrument panel (I/P) insulator.
2. Remove the glove box assembly. Air temperature actuator (right side)
   
   
3. Remove the mounting screws and right air temperature actuator from the HVAC module assembly.
4. Disconnect the right air temperature actuator harness connector.

To Install:

1. Align the right air temperature actuator slots with the flats on the actuator door shaft.
2. Install and secure the right air temperature actuator on the HVAC module assembly with the mounting screws.
3. Connect the right air temperature actuator harness connector.
4. Install the glove box assembly.
5. Install the right lower I/P insulator.
6. Calibrate the mode actuator.

Left Side To Remove:

1. Remove the left lower instrument panel (I/P) insulator. Air temperature actuator (left side)
   
   
2. Remove the mounting screws and left air temperature actuator from the HVAC module assembly.
3. Disconnect the left air temperature actuator harness connector.

To Install:

1. Align the left air temperature actuator slots with the flats on the actuator door shaft.
2. Install and secure the left air temperature actuator on the HVAC module assembly with the mounting screws.
3. Connect the left air temperature actuator harness connector.
4. Install the left lower I/P insulator.
5. Calibrate the mode actuator.

your blend door actuator gear is slipping. remove actuator and check blend door for free movement. If jammed, you may have to open the system to unjam. If door is free to moe, replace actuator. See procedure below to access blend door. Not sure you need a lift, as long as you can get the 2 nuts off under the truck.

Removal & Installation

1. Position the vehicle on a hoist with the gear selector in NEUTRAL.
2. Remove the left-side quarter trim panel.
3. Remove the parts in the order indicated in the following illustration and table.

Fig. Blend door actuator - auxiliary

(1) Auxiliary line floor pan bracket nut (2 req'd)
(2) Auxiliary housing bolt
(3) Auxiliary housing bolt
(4) Auxiliary housing nut
(5) Auxiliary harness electrical connector
(6) Blend door actuator electrical connector
(7) Screw (3 req'd)
(8) Blend door actuator

To install:

1. Installation is the reverse of the removal procedure.
2. Observe the following tightening specifications:
   
   Auxiliary line floor pan bracket nut (2 req'd), 71 inch lbs. (8 Nm) Auxiliary housing bolts, 62 inch lbs (7 Nm) Auxiliary housing nut, 62 inch lbs (7 Nm)
   

blend door or temp contrl switch is bad.

Section 12-02: Heating and Defrosting 1998 Windstar Workshop Manual
REMOVAL AND INSTALLATION Actuator Motors, Electric Temperature Blend Door
Removal

1. Remove cassette storage box or center shelf unit, if equipped.
   

1. Remove instrument panel ash receptacle (04810) by depressing service lever.
   

1. Disconnect electrical harness connector from electric blend door actuator.
   
   
   
   
   

1. Remove three retaining screws.
   
   
   
   
   

1. Carefully pull electric blend door actuator outward and off A/C evaporator housing (19850) assembly.
   

Installation

1. Follow removal procedure in reverse order.
   

1. Air temperature control door shaft is keyed. Move door to properly insert electronic actuator shaft. Make sure the shaft is completely in and properly seated.
   

Look ,behind the glove box,on top of the hac box,toward the center of the truck,it is a flat box,with a multiple wire plug in it,it is the temp door actuator motor,that turns as you select the cold,to hot selection,it may not be turning all the way for hot.You can remove this motor,and turn it,yourself to see,it is hard to do,because it is ressesed in the box.

"Blend door stuck and clicks on your 2003 Ford Explorer?\" FIRST BUY OEM BLEND DOOR MOTOR $57.00 + UP TOOLS NEEDED : PANEL TOOL OR FLAT BLADE SCREWDRIVER ,1/4 SOCETS 7 & 8MM ....1/4 HANDLE...1/4 SMALL EXTENTION...1/4 RATCHET NO NEED TO REMOVE WHOLE DASHBOARD!!! REMOVE TWO7MM SCREWS FROM THE BOTTOM OF STEERING PANEL & PRY AND REMOVE PANEL. NEXT REMOVE TWO 7MM SCREWS ON BLACK PLASTIC STRIP THAT YOU SEE AFTER REMOVING STEERING PANEL....PRY THIS STRIP OF PLASTIC OUT JUST A LITTLE AND CUT IN THE MIDDLE . NEXT REMOVE TWO 7MM SCREWS FROM AROUND TOP OF INSTRUMENT PANEL (BY GAUGES ) PRY PANEL STARTING FROM AROUND VENT ON LEFT BY DRIVERS DOOR ""THIS PANEL WILL STAY IN PLACE LOOSE... NO NEED TO REMOVE!"" NEXT YOU WILL SEE 0NE 7MM SCREW BY GEAR SELECTOR AREA.. BEHIND THE LOOSE PANEL REMOVE THIS SCREW.. ALSO IN SAME AREA BUT LOWER THERE IS ONE 7MM SCREW THAT NEEDS TO BE REMOVED THAT HOLDS LOWER DASH PAD ITS FOUND BEHIND LOWER CORNER OF DASH PAD.( LOWER DASH PAD GAS PEDAL AREA ) "DON'T"!!! REMOVE THE FOUR 10MM BOLTS!!!! IN SAME AREA NEXT REMOVE RADIO /AC CONTROL TRIM WITH THIN SCREW DRIVER OR PANEL TOOL IT HELD IN BY SIX CLIPS...NO NEED TO DISCONNET ANYTHING IT WILL STAY THERE HANGING!! NEXT REMOVE TWO CENTER CONSOLE LOWER LARGE PLASTIC CLIPS BY FLOOR MATS. NEXT UNDER SQUARE BLACK RUBBER AT CENTER CONSOLE REMOVE ONE SILVER SCREW. MOVE SEATS FOWARD AND REMOVE TWO 8MM SCREWS FROM SIDES OF CENTER CONSOLE FROM BACK SEAT. PRY CUP PANEL SECTION THAT WAS HELD DOWN BY SILVER SCREW ...PRY UP TOP HALF OF CONSOLE STARTING FROM SECTION WHERE ARMREST DOOR IS.. DISCONNECT LIGHTER PLUG AND REMOVE PANEL . NOW YOU WILL SEE SIX SCREWS STARTING FROM BELOW RADIO TRIM WORKING BACK TO ARMREST DOOR .REMOVE ALL SIX..THESE HOLD THE BOTTOM PORTION OF THE CONSOLE ALSO DISCONNET ONE BLACK PLUG AND PULL ALL THE WIRES CLIPPED DOWN...PULL BOTTOM PORTION OF CONSOLE TO BACK SEAT. PULL LOWER DASH PAD GIVE A NICE TUG.. IT SHOULD MOVE OUT A LITTLE ..DID YOU REMEMBER ONE SCREW BEHIND CORNER DASH..!.STARTING FROM AREA BY GAS PEDAL LOOK UP IN THIS AREA YOU WILL HAVE ENOUGH ROOM TO GET A LONG EXTENTION WITH AN 8MM SOCKET TO REMOVE 3 SCREWS HOLDING MOTOR TO BLACK PLASTIC SECTION.. REMOVE SCREWS DISCONNECT SMALL BLACK PLUG AND PULL MOTOR FROM SOCKET GOING TOWARD DRIVERS DOOR DIRECTION. ALIGN NEW MOTOR SHAFT WITH SOCKET TIP.......IF NEED BE..... YOU COULD PLUG MOTOR HARNESS INTO NEW MOTOR THEN TURN IGNITION ON AND MOVE HEATER/AC CONTROLS TO GET THE SHAFT LINED UP..DONT MOVE ANY OTHER WAY!!!!!! NOW PUT SHAFT INTO SOCKET MAKE SURE YOU CONNECTED THE PLUG IF YOU HAVEN'T ALREADY!! INSTALL 8MM SCREWS AND TRY IT OUT YOU SHOULD HAVE HEAT NOW NOW INSTALL EVERTHING BACK IN REVERSE ORDER