What Causes Car AC to Freeze and Stop Blowing Air?

[MacNora]

The reasons why a car's air conditioning freezes and stops blowing air include: 1. Clogged AC filter: This prevents airflow, leading to freezing. 2. Blower motor failure: A damaged blower motor stops the AC from blowing air. 3. Issues with the car's AC control system: For example, a faulty expansion valve with excessive opening can cause the evaporator temperature to drop too low, resulting in ice blockage and preventing airflow. Detailed analysis of why a car's AC freezes and stops blowing air: 1. Clogged AC filter: When the AC operates, outside air passes through the filter before entering the car, trapping many airborne particles and easily becoming clogged. You can remove the filter to check if it's too dirty—excessive dirt can block airflow. 2. Blower motor failure or damage: This will inevitably stop the AC from blowing air. Overheating of internal coils or capacitor damage can cause blower motor issues. You can test by setting the AC to maximum speed and listening for the blower motor's sound to determine if it's faulty. If a fault is detected, promptly visit a 4S shop or repair facility for inspection and repair.