Why Can't the Car Air Conditioning Blow Hot Air?

[DelNatalie]

There are several reasons why a car's air conditioning cannot blow hot air: 1. Clogged heater core: The heater core is a simplified version of the engine radiator, with multiple small cooling pipes inside. Like the radiator, it is prone to clogging. When the coolant flowing through the heater core gets blocked internally, it slows down the airflow, reduces the flow rate, and results in insufficient heat, leading to poor heating performance. 2. Insufficient coolant in the cooling system. 3. During parking and driving, the car's air conditioning intake sucks in a large amount of dust and dirt, which then adheres to the evaporator. These deposits, under the high-temperature and high-humidity conditions of the evaporator, breed a large number of fungi, causing dizziness and nausea for passengers and posing health risks. Additionally, they affect the cooling and heating performance of the car's air conditioning.