By Jeff Frank First you have to remove the glove box to gain access to the plenum. Next, remove the actuator from the box. The actuator is a flat white box that sits on 4 clip posts on the top-left of the plenum. It has a wire harness coming out of it. To remove it take a flat screw driver and pry up the front first then put the screw driver under and towards the back to pop up the back. You will see a white pin coming out of the bottom of the actuator. The pin is "D" shaped. Turn the ignition on and move the heat control and you should see the pin rotate. If not, the actuator is bad or the terminals are corroded. If it does move, set the control to full heat and turn the blower on high. This will force the blend door into the heat position (it is very important to do this). Take a small dentist mirror and a flashlight and look into the top of the box where the actuator pin goes in. You should see that the chamber is half missing. It should look like the drawing below: I think they all break in the same spot. Mine was in the position as the one above. Remember you are looking through a mirror so it is a little difficult to determine the exact position. If yours looks like mine did drill your actuator pin in the same place I did. If not, try and gauge where yours will need to go. I had to drill mine four times before I got the right position. I drilled mine with a very small drill bit. If you are looking at the pin from it's bottom, this is where it should be drilled: (drill about 1/2 inch from the bottom) After drilling the actuator pin hole, you will need something to put through it. I used an old drill bit that was the same size as the hole. Just cut it to length (you will want a little more than 1/8th inch on either side of the pin). Put the rod through the pin (it should be snug so that it doesn't fall out). Then try snapping the actuator back on the box. If the pin won't go in fully the rod might be in the wrong place. Try turning the blower on high again to make sure the door didn't move and try again. If it still won't go in you will have to re-drill the hole. If it does go in, try the heat controls. If they work, congratualtions! Now take the actuator back out and glue the rod in place and put the actuator back on. You just saved yourself $1000. If only the cold or heat works, then either the rod is in the wrong position and will need to be re-drilled, or the door itself is also broken.
How do i replace blend door motor
how to replace a blend door actuator on a 1999 ford ranger
I believe you are looking for blend door actuator???
If you have the 4.6 liter expedition then you dont have a heater control valve. The problem stems from a bad blend door motor or the blend door is broken where it mates with the blend door motor. Blend door motor is located under dash board behind the center counsel. Its white in color and has a plug with 3 wires. The problem is most likely with the plastic blend door itself. The same plenum box is used on the Expedition/Navigator/F150 and you can find information on the common problem on any of these models. There is a video on YouTube showing how to diagnose and repair the system. The actuator motor is hard to get to on the Expedition, but once you get to it, the full repair for the blend door and actuator is within the capability of most shade tree mechanics. This is an expensive repair at the dealer or any garage, so a little investigation of DIY methods may be useful. Check links through my bio page as a starting point.
Generally the problem is with a broken blend door, not a bad actuator motor. A solution is available at www.heatertreater.net and additional information can be found by checking my other posts on this forum. cgallen
the blend door actuator has a gear missing teeth an it can't finish the comand
Probibly your blend door motor is stripped out. Remove motor and check door operation manually
To answer your question are you referring to your A/C and Heating temperature control unit? The temperature control which is next to the A/C control knob which you adjust the temperature from cold to hot? When you adjust it between cold and hot it opens a blend door via blend door motor to get the desired temperature.
The Expedition uses the same HVAC system as the Ford F150 pickup truck. The Expedition is a little tricky because you have to remove the center console and floor heat distribution vent to access the actuator motor. Once you remove the motor, you can examine the blend door axle for cracks or breakage. This is a common fail mode on the Expedition. HeaterTreater is the world's leading company for aftermarket blend door fixes and has a product for the Expedition. Additional diagnostic information and pictures are available on the Ford Expedition HeaterTreater Ebay listing or the web site at www.heatertreater.net. There is an inexpensive effective fix available that replaces the cheap plastic door with steel that will outlast the vehicle. cgallen
Does your blower motor work? If it does and there is no heat the blend door actuator is probably not working and is not letting warm air into the vehicle. The blend door is staying in the cold position.
The blend air door is most likely located beneath your dashboard. In some instances, there may be than one blend air door - one on the passenger side and one on the driver's side. Of course, this is dependent on the model and year. For some designs the blend door is on a vertical axis and horizontal on others...and the actuator motor can be on top, bottom, back or front. Not much of an . If you have a specific automobile that you are concerned with, I can be much more help. cgallen ford expedition 1999 Eddie Bauer
There are pictures of the the blend door motor both on and off the vehicle along with the part number for the replacement part online @ http://rides.webshots.com/album/558283664kZtBbU. Hope this helps.