Kenny helped me open the dash to my car to reveal what I had suspected: a cable end had come off in the November accident which is why I was only getting hot air. It was a quick fix thanks to him and I once again have cold air! He also went a step further and attached the fitting so it wouldn’t slip off again. It appears the factory clip was missing. Weird.
I finally understand enough about side chaining I am going to have to write a tutorial on it. There is a lot of stuff online but there are some crazy solutions some folks have come up with. I have uploaded a newer version of Project 20 which has the bass, chords, and layers compressed to the kick drum. Yay!