Chrysler Repair: Heating Cooling controls on 2000 Grand Voyager, calibration tests, postal mail

Question
My daughters 2000 Grand Voyager has 2 sliding controls for temperature. The passengers' control works fine but the driver side control sticks on hot even when its pushed to cool. If the slide lever is pushed quickly and hard to the cool side a few times the temperature will come down.
 Does the control need replacement? How difficult is it to get at?

Thanks

Jay

Answer
Hi Jay,
The temperature of the air controlled by the position of an internal door in the air distribution housing called a "blend-air" door. It is operated by an electrical actuator that responds to the lever position. The system sometimes gets out of calibration between the lever and the actuator(s) so it is useful to do a 'self-calibration/diagnostic' test to see if that might correct the problem. If not, there is a way to interpret the flashing of various lights to see what the control panel believes to be the reason for the problem. So I would begin by doing this:
Starting the tests is fairly straight forward, but following up on any faults requires further action/interprestation of the way the lights are flashing at the conclusion of the first test. All the possibilities cover about 6+ pages in the manual.
But let us give it a try. The engine must be running. Set the blower on HIGH, set mode to the PANEL position, open all AC outlets, Set temperature slide pot(s) to COLD, Depress WASH and REAR WIPER simultaneously for 5 seconds (Until all LED's light). The LED's will stay on for 5 seconds. Calibration tests are running when the rear wiper and intermittent are alternatively flashing. Cooldown test is running when the A/C and recirc lights are flashing.
Acceptable result is when the rear wiper only LED is flashing.
Push rear wiper button to exit.
Interpretation of codes (presumably stored if you don't get the above result) is an involved process for which it would be better to xerox copy and postal mail you the pages.
So see whether your unit seems to behave according to what I have described, and please let me know.
In any case, the actuators for the two blend doors are located on the driver's end of the air distribution unit and you can get to it if necessary to replace by removing the panel under the dash to the right of the steering column, and if you abs remove the abs control module, and that gives you the necessay access to the actuators.
Let me know what you learn and we can go on from there if necessary.
Roland
Roland