Hopefully, the arm was "NOT" attached for some reason other than a broken gear in the airmix actuator. If the actuator is broken, then you may have some goofy things occuring when trying to select a temperature. Default with the rod unattached is full heat.
Recalibration procedure is as follows:
1. With actuator rod NOT engaged on the white airmix door connector, start car.
2. Set ECC to full HEAT (90*) I use the "AUTO" setting.
3. Let car run for at least 45 seconds. (You will see the actuator rod move all the way over to the right. The airmix door will move to its furthest postion by defalt)
4. While the car is still running and on full heat, snap the actuator rod into the white connector on the airmix door without changing the postion of the airmix door or the arm that attaches the rod to the actuator. This can be done using a long bladed screwdriver through the hole in the support brace behind the glovebox. (See explanation below for more detailed instructions on lining up the rod and the white connector)
The small plastic box is the airmix actuator, and the rod that comes off the box snaps into a small, white, round connector on the airmix door.
This pic is looking through a hole, behind the glovebox that shows the rod in place in the white connector. The trick is to line up the rod with the connector and, using a long flat-bladded screwdriver to "pop" the rod back into the connector. The white connector has a v-shaped groove on the top to help guide/line-up the rod. The rod has threads on the end that goes into the white connector and the threads need to be in line with the connector.
So, start your car and set your temperature **** to "Full Hot". Let it run for at least 45 -60 seconds. This moves the "rod" all the way to the passenger side to calibrate the system and moves the rod to line up best with the connector. The airmix door and it'* white connecter should already be over as far as it can go to the passenger side.
Use the screw driver to line up the rod on top of the connector and to "spin/rotate" the white connector until you think/feel/see the rod drop into the v-groove on top. Then carefully use the screwdriver to "pop" the rod into place. If all works well and your actuator (the small black box that the other end of the rod is connected to already) is not broken, you will have heat and cold again under your control.
This process sounds worse than it is and once you look through the hole and see the connector and rod, it starts to make sense. Don't get too frustrated if it takes a few tries to pop the rod onto the connector as lining it up takes some patience and a couple of tries.
Originally Posted by Echo SSEI
This pic is looking through a hole, behind the glovebox that shows the rod in place in the white connector. The small plastic box is the airmix actuator, and the rod that comes off the box snaps into the small, white, round connector on the airmix door.