Worked on the HVAC system on my daughter's car by watching her check if the fuse for the blower was to blame. She was hoping yes. But no luck. The fuse was fine. Got her to set up an account on a vehicle specific discussion forum and post a good question. Tomorrow is another day.
I'm learning about the PCV system on my car. As I install a catch can, I want to check the PCV system. I have small oil leaks, I have dirtier emissions, I have oil loses between oil changes and all of those things could be related partly to a sub-par PCV system.
This video was instructive.