@M60A3Driver wrote an excellent post on removing the climate control module..
https://www.crossfireforum.org/forum...tml#post996771

After examining his post and some of the above answers, I have some more qualification questions:
1) Does the fan speed dial change any of the position of the white mechanical linkages at the back of the unit.
2) The two slider ***** for passenger and driver temperatures, must have a potentiometer. Do they go bad causing the temperature to fluctuate?

I can see how the potentiometer in the fan **** can go bad and cause erratic fan speed changes.

Personally I believe the white linkages go to a vacuum valve(s?) to control the various dampers for moving air to different positions. See red arrow.