What's the matter with car air conditioning and heating?

Warm air comes from the heat generated when the engine is working: when the cooling system of the engine radiates heat to the engine, the radiated heat is sent into the car through the fan to form warm air; When the warm air is not used, the fan stops running, the hot air port is closed, and the heat emitted will be completely dissipated into the atmosphere. Therefore, the car heater belongs to waste recycling and will not consume oil.

Precautions for heating air:

1, the warm air only uses the thermal cycle in the car, and there is no need to start the air conditioning compressor at all. So you just need to adjust the air conditioning button, and you can turn on the heater without turning on the AC switch.

When the car starts, the engine starts to warm up. After the engine temperature pointer points to the middle position, first turn on the warm air conditioner, and set the air circulation to external circulation, so that the cold air in the car can be discharged outside the car. After waiting for 2 to 3 minutes, set the air circulation to internal circulation.

Extended data:

Automobile warm air fault conditions:

1, heater water tank blocked

The structure of the warm air water tank is actually a miniature version of the radiator of the engine water tank, and there are many small cooling pipes in it, which are as easy to block as the radiator of the water tank. After the inside of the warm air water tank is blocked, the coolant flows slowly, the flow rate becomes smaller, and the heat is insufficient, so the air conditioner warm air is naturally not hot.

2, thermostat failure

The common fault of the thermostat is that it can't be opened, but the reason why the warm air is not hot due to the thermostat fault is that the thermostat can't be closed, commonly known as the thermostat is always open. After the thermostat is opened normally, the coolant begins to circulate from the idle speed of the engine. If the water temperature is low for a long time in winter in the north, the air conditioning warm air will naturally not be hot.

References:

People's Daily Online-Will heating the car in winter really increase fuel consumption?

References:

People's Network-Why is it so cold? In winter, the air conditioner and warm air are not hot as hell.