There are three that I'm aware of. Two left side under dash. One for driver side blend door and the other controls defrost/vent/floor position door. This one is very difficult maybe impossible to remove and check without removing entire dash. You can manipulate it by moving the linkages with your finger. It has a semi-circular lever that the actuator causes to pivot around to move the blend doors. I had to manually move mine to the defrost position for winter weather. I going to replace the programmer before I attempt to remove the entire dash. The programmer is inexpensive and can be googled online if you dont want to pay dealer.
Here is a guide to help you see what you are in for when doing the job.
Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
Images (Click to enlarge)
Sunday, January 16th, 2011 AT 4:32 PM