BMW mini air conditioner heats slowly.

1, the thermostat is always on or the thermostat is turned on too early, which makes the refrigeration system perform a large cycle too early and the outside temperature is very low; 2. The water pump impeller is damaged or lost, so that the flow through the warm air small water tank is not enough, and the heat does not come up; 3. There is air resistance in the engine cooling system, which leads to poor circulation of the cooling system; 4. The filter screen is dirty and blocked, which leads to insufficient air volume or poor distribution of hot and cold air, so that the heat of the warm air small water tank cannot be radiated. Automobile air conditioning can cool, heat, ventilate and purify the air in the compartment, provide a comfortable riding environment for passengers, reduce the fatigue intensity of drivers, and thus improve driving safety. It generally includes refrigeration device, heating device and ventilation device.