How to turn on the heater switch of Mercedes 400? Where is it?

How to turn on the warm air of Mercedes-Benz 400: 1 If it is an automatic air conditioner, turn up the temperature of the air conditioner and turn on the fan on it. If it is a manual air conditioner, turn the hot and cold air switch to the red area, and then turn on the fan. 2. If your car has a warm water valve, you can touch the warm air valve behind the two warm air pipes by hand. If the temperatures are in the same open state, if one is hot and the other is cold, it is closed. 3. There are two black hoses with the same thickness behind the firewall in the engine heating pipe. You can judge by hand and turn the knob in the workbench to the red area.