Ok so I'm having a problem with my temperature knob sticking. I just replaced the compressor, condenser, dryer, expansion valve etc etc. All done properly with new seals and oil and vacuum pump. For some reason, after this job the knob has difficulty switching between the hot and cold sides?? I have a video that shows the problem but I don't know how to upload? Any ideas on what could be wrong? Or how to post the video? Thanks in advance!