So the wiring issue in the fuse box was related only to the headlights (combo switch on column is broken).

Fuses have been replaced. Nothing changed with that. Sometimes it seems like the AC compressor engages; RPM drops a couple hundred then goes back up.

Switching from EC to 'white down arrow' button will increase fan speed, even with the fan already set to full speed.

More air is coming from the center vents than the driver/passenger vents; even less coming from the passenger vent.

This seems like it is either a bad relay or a short in a wire. If it was a relay, is there a way to override it? If so, how?

Thanks.

Bill