If the car doesn't go, the preheating will be slow. And it's bad for the car. You can turn on the heating when the water temperature exceeds 40 degrees.
Diesel engine is compression-ignition type, which can inhale a large amount of air in advance for compression, and the heat energy generated after fuel combustion can be used for volume expansion of a large amount of gas. The volume change of V2-V 1 is much larger than that of gasoline engines. In fact, a lot of thermal energy of diesel engine is used to push the gas to expand and drive the piston to move (that is, the required power), and the remaining small amount of thermal energy is discharged through cooling water and tail gas. Natural diesel engines will use less "wasted heat energy" to heat cooling water. It is logical that the water temperature of diesel engine rises slowly. The heat of the car is converted from the steam in the water tank into heat and comes out from the air outlet. Generally, after the car is started, the water temperature rises, and it is also possible to heat inside the car. Heating has high-grade, medium-grade and optional.