How to turn on the heater in Mercedes-Benz 400? Where is the switch?

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