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As an update for anyone, I pulled apart the dash. Found the main inlet actuator was clicking. But first replaced the cabin temp/humidity sensor and my hvac has been working 100% for days now. Stress tested in over 100° weather on my road trip down to Los Angeles.

Oh really that’s interesting. Maybe it is just the cabin sensor. I found it was covered in fuzz

2014 Model S P85D I’ve got a strange issue where the cabin temperature whether in auto or manual will suddenly switch from cooling to heating on any temp setting except low. Meaning if it’s 90° outside and I have the interior temp set at 67° all of a sudden my car will start heating full blast...