1980 v6 with air. Sorry, no pictures at this time. Starting at the fuse block. Brown wire to "Low blower speed ambient temperature switch". I've got a bounty on a nos part. It is my understanding this switch controls only on off low blower speed at or near 55 degrees. This switch has 2 wires coming out of it. 1 yellow that feeds directly into the harness that goes to the engine compartment out to the blower resister. The other wire is brown and goes to the bilevel switch mounted on the control head for the ac/ heater controls.