Where is the Volkswagen cc heater water tank located?

Front end.

Just at the front of the engine, look at the antifreeze indicator, which is the one containing the red liquid and has a scale on it.

The function of the car heater water tank is that the cooling water absorbs the heat in the water jacket, flows into the radiator, then dissipates the heat, and then returns to the water jacket and circulates continuously. The car heater water tank is mainly composed of the radiator core , water pipes, cooling air blades, upper water tanks and lower water tanks. On the radiator, the upper water tank is connected to the water tank below the radiator through the water pipes.