Where is the Mode door actuator located?

The mode actuator is called the "air distribution door actuator" and it is under the dash on the left side above the gas pedal. You might be able to get at it by removing the steering column. Here is a generic guide to help you see what you are in for when doing the job with the instructions in the images below for your car:

https://www.2carpros.com/questions/location-of-the-a-c-heater-blend-door-actuator

Check out the images (below). Please let us know if you need anything else to get the problem fixed.