Where is the water valve of Mercedes-Benz glc260 heater?

In the engine compartment. The working principle of the automobile heater is that the radiator in the heater is connected with the circulating water of the engine through the water inlet and outlet pipes, and the water valve is a switch. The water valve of the Mercedes-Benz glc260 heater is located in the left front of the cab and in the engine compartment, controlled by the air conditioning control panel, and the switch of the heater valve is electric.