Why is there no air coming from the car's air conditioning heater?

[LeAlaina]

The reasons why the car's air conditioning heater is not blowing air are: 1. The thermostat is damaged, causing the cooling system to enter the large circulation prematurely; 2. The air filter is dirty and clogged, affecting the heating effect; 3. The heater control button is damaged and cannot transmit the corresponding heating signal; 4. The heater core is blocked, preventing coolant from passing through it; 5. The water pump impeller is damaged or slipping, resulting in insufficient flow through the heater core. The functions of the car heater are: 1. To provide warmth inside the car and increase the interior temperature; 2. To defrost. The working principle of the car heater is: a complete set of devices that blow cold air onto the surface of the heat exchanger, absorb its heat, and direct it into the car, thereby increasing the interior temperature.