It is a kind of waste utilization, which will be consumed and discharged without warm air. Therefore, the influence of warm air on fuel consumption can be said to be minimal. But turning on the warm air when parking will increase some fuel consumption.
The first thing to look at when expanding the data is the water temperature. Normal water temperature is the premise of warm air. Because the heat of the warm air comes from the coolant, the coolant circulates in the warm air box to heat the warm air box. The structure of the heater box is the same as that of the large water tank in front of the engine, with many holes in the middle. The wind from the blower can pass through the warm air tank, so that the air is heated and hot air is blown out.
If the water temperature is always very low, then the temperature of the warm air tank must be very low, and the wind blown out by the warm air tank will definitely not be hot, so the water temperature is the key. Look at the thermometer to know whether the water temperature is normal, about 90 degrees. If it's only 60 degrees, or the water thermometer has been at the lowest point, it's a fault. At this time, find the reason for the low water temperature. When the water temperature is normal, there will be warm air