Why Doesn't the Car Blow Warm Air?

[LeConnor]

The reasons why a car doesn't blow warm air are as follows: 1. Thermostat failure, causing the cooling system to prematurely enter a large circulation cycle, resulting in no hot air. 2. Dirty or clogged air filter, affecting the efficiency of the warm air. 3. Faulty warm air control button, unable to transmit the corresponding signal for warm air supply, leading to no warm air. 4. Clogged heater core, preventing coolant from flowing through it, resulting in no hot air. Below is the principle of how a car produces warm air: When the car's heating system is operating, the high-temperature coolant from the engine flows through the heater core. At the same time, the air blown by the blower also passes through the heater core, allowing the car's air conditioning vents to blow warm air.