What Are the Reasons for No Airflow from the Rear Air Conditioning Vents?

[DiJulianna]

Reasons for no airflow from the rear air conditioning vents are as follows: 1. Air leakage at the connection between the evaporator case and the air duct: If there is air leakage at the connection between the evaporator case and the air duct, the cold air released from the rear air conditioning vents will continuously escape from the leakage point, resulting in reduced airflow from the rear vents. 2. Issues with the cabin air filter: The cabin air filter is located at the intake of the blower. All cold or warm air blown out by the car's air conditioning system must pass through the cabin air filter. However, the cabin air filter is prone to accumulating dirt. If the owner does not replace the cabin air filter in time, it can easily become clogged with dust, leaves, and other debris. This reduces the airflow passing through the filter, consequently decreasing the airflow from the rear air conditioning vents. 3. Poor sealing of the auxiliary air ducts: The rear air conditioning vents are connected to the blower via auxiliary air ducts. If the sealing of these ducts deteriorates, leading to air leakage, the airflow from the rear vents will also decrease accordingly.