Blend Door not fully closing for Heat
I've read all of the threads on this chain and cannot seem to figure out my issue. I just replaced the blend door actuator on my 2003 Ford Explorer. It seems to be working as the door moves when switching between hot and cold. However, when I switch to full hot/warm, the door does not close all the way, causing only room temperature "heat" to come out. Does anyone know what is causing this issue, or how to fix it?
Here is a link to a video I shot of what can be seen from inside the glove box door. There are tons of youtube videos of the temporary fixes for broken blend door actuators by just pushing down the tab to the door within the glovebox, and then sometimes zip tying it down or some sort of temporary fix (just youtube ford explorer blend door actuator, and you'll see what I'm talking about). My door doesn't click or anything, it just does not shut all the way as you'll see in the video. I did not narrate the video, so here's an explanation.
First, the video is essentially upside down because of the way I had to hold the camera phone. The video starts with the thermostat in full heat mode. I then turn it to cold, and you will see the arm start going and then sort of flick up then continue on to rest against a little silver metal "nipple" looking thing. You can hear it still working, and it takes about 2 seconds for it to decompress that nipple. I then turn the switch back to full heat, and as you'll see, it takes about 2-3 seconds for it to start engaging, even though the motor is working. When it starts going, it only goes about halfway of what it's supposed to go to fully close the blend door. I then stick my hand down, push down the lever so it's fully closed. Then I turn the switch back to full cold, and you'll see that it pops up again like it did in the beginning.
Any ideas what this might be? Broken door, bad actuator, bad heater valve, etc.? Any insight is much appreciated.
https://www.youtube.com/watch?v=4ANLJXg5UCQ