The radiator in front of the new alto water tank is. Add antifreeze and open the lid. There is a white plastic bucket next to the headlight on the right, which is green and watery. Look at the water level there. If it's lower than MIX, add it. Add antifreeze instead of water.
Most cars are installed in the middle behind the dashboard. You can only see the dashboard when you remove it. The position where the warm water pipe behind the engine leads to the instrument is the warm water tank.