I vacuumed out the cabin temp sensor, with our 3 stage built in home unit, and the fan speed control is working near flawlessly now. I do this whenever I vacuum out the car so it wasn't that dirty to start. Here is a video I found quite interesting on working on this switch. https://www.youtube.com/...

Over the last few years the blower fan speed control knob has been having episodes of not working very well, and getting worse. I can rotate the knob and it won't do anything, or doesn't change the fan speed with each click if it does work some. The led still indicates the fan speed correctly. The l...