Why is the heater water tank switch of King Kong car on?

Hello, if your car has a warm water valve, you can touch the two warm water pipes behind the warm water valve by hand. If the temperature is the same, it is open; if one is hot and the other is cold, it is closed. There are two black rubber hoses with the same thickness at the firewall behind the engine, which can be judged by hand. Turn the knob to the red area inside the workbench (the blue area represents cold and the red area represents hot)!