Maybe it’s the hot/cold blend door actuator? You have to take out the glove box and a plastic panel left side of the passenger footwell to see it in action. Try having the heat all the way up, then turn it down slowly and see if the actuator moves. It was one of the things I checked when I had my high pressure hose spring a leak. If you can’t figure it out, I recommend going to the dealer for an AC diagnostic. Firestone tried to overquote me for both hoses before I had the dealer look at it.