What Are the Reasons for Weak Airflow in Car Air Conditioning?
2 Answers
The reasons for weak airflow in car air conditioning are: 1. Blockage of the dashboard air vents; 2. Air leakage in the dashboard air duct; 3. Abnormal air direction control mechanism; 4. Abnormal air direction control motor; 5. Low blower fan speed; 6. Abnormal blower speed control module; 7. Frozen air conditioning pipes; 8. Abnormal air conditioning control module. The components of car air conditioning are: 1. Compressor; 2. Condenser; 3. Evaporator; 4. Liquid storage dryer; 5. Expansion valve. The methods for using and maintaining car air conditioning are: 1. Do not set the temperature too low; 2. Control the direction of the air vents; 3. Avoid prolonged use; 4. Appropriately increase the airflow volume; 5. Turn off the air conditioning when driving at low speeds.
Low air conditioning airflow usually stems from these common issues. Last time my car had this problem, I found the cabin air filter was clogged like a carpet - completely blocked by leaves and dust. Replacing it solved the issue immediately. Also, if small objects like cards get stuck in the blower motor, it causes abnormal noises and reduces airflow by half. Don't forget to check the blower motor resistor - my friend's car only got airflow on the third speed setting because of a faulty resistor, which cost a few hundred to replace. Inspect the evaporator too; if it's heavily frosted, it acts like an ice wall blocking airflow - this requires checking refrigerant pressure and temperature sensors. Finally, examine the air blend door actuator; if it's stuck in the minimum airflow position, adjusting the fan speed won't help at all.
