What Causes No Airflow in the First Three Gears of a Car's Air Conditioning?

[Barbara]

Reasons for no airflow in the first three gears of a car's air conditioning are as follows: 1. Evaporator Box Air Leak: If there is an air leak at the connection between the evaporator box casing and the air duct, the cold air that should be released from the air conditioning vents continuously leaks from the gap, resulting in reduced airflow from the vents. 2. Air Filter: The air filter is located at the intake of the blower. All cold or warm air blown by the car's air conditioning must pass through the air filter. However, the air filter is prone to accumulating dirt. If the owner does not replace the air filter in time, a large amount of dust can accumulate on the filter, which naturally reduces the airflow passing through it. 3. Poor Sealing of Air Ducts: The air conditioning vents are connected to the blower via additional air ducts. If the sealing of these ducts deteriorates, air leakage occurs, reducing the airflow from the vents.