Any Toyota Techs on here?

Got a update. It was heating good enough to get by. However yesterday while driving on the highway it started blowing cool. WTF?! I got to my destination did my thing. Got back in and its blowing warmer now. Still not as good as it was. I thought I had replaced the heater control valve but, i didnt. I did throw a used one on there to see if it made a difference, it didnt. Gonna put a new one on today. I'm not optimistic. After that I got nothing.