I had a similar problem with my 2014 Limited. Hot air on the right side of the cabin, cool to the left (driver). Had to have it fixed at the dealer. $122 parts. $304 labor.
Well, let's just say that if the next car that I get, if it has DRL, unless required by law, they will be turned off. If they can't be switched off, then I will remove the fuse from the box to make sure that they are off.
OK now I get it. Yeah if what I have is the dual note horn and the single note is something wimpy like the Camry, then that would really suck. The only thing that sucks worse than a horn on a Toyota are daytime running lights. And I won't drive a car with either.