Climate Control Temperature Sensor

[Cr from Texas]

I'm still a newbie on this forum and haven't mastered all the search details. I'm sure this is here somewhere. Can someone direct me or reply to this question.
How does the dash mounted temperature sensor connect to the CCU? I'm putting a hard plastic cover over my badly cracked dash and want to move the sensor to a shaded spot to avoid the intense summer sun in Texas. I've found in other threads that there is a foam tube that could go bad and should be replaced by a rigid plastic tube. Apparently there is airflow through this sensor and tube to where? How long can I make the tube? Newer MB had the sensor above the rearview mirror - was that an air tube or electrical connection to the CCU? I found a thread that showed a picture of a replacement with a rigid tube - found it by accident and now I can't find again. That poster could probably answer my questions.

I'm spending hours searching and reading - got to be a better way. I just caught on to thread subscription but that's not always given as a choice, why? I need a forum tutorial.

Charles