Why is the central air conditioning in the car not blowing air?
3 Answers
If the central air conditioning in the car is not blowing air, it may be due to overheating damage of the internal coil, capacitor damage, or failure caused by a malfunctioning blower fan. Below is relevant information about car air conditioning: 1. Cooling Principle: When the car air conditioning is cooling, the compressor clutch engages, causing the engine to drive the compressor. The compressor continuously compresses the refrigerant and delivers it to the evaporator. Inside the evaporator, the refrigerant expands and absorbs heat, cooling the evaporator. The cooled evaporator then cools the air blown by the blower fan. 2. Heating Principle: When the car air conditioning is heating, the high-temperature coolant from the engine passes through the heater core. At the same time, the air blown by the blower fan also passes through the heater core, allowing the air vents to blow warm air.
When I encountered the issue of no air coming from the central air conditioning, I carefully considered that it might be due to a faulty blower motor—the fan isn't spinning, so no air is blowing out. Alternatively, a blown fuse could cut off the electrical current, leaving the blower without power to operate. Poor contact in the control buttons or switches, leading to unresponsive keys, could also result in no airflow. For automatic air conditioning systems, a malfunctioning control module is often the primary cause, such as sensor or computer chip issues, causing the system to become unresponsive. A clogged filter is another common problem; dust buildup restricts ventilation, reducing or eliminating airflow. Regularly replacing the cabin air filter and cleaning the air ducts can effectively prevent this. If you encounter this situation while driving, avoid stopping abruptly. First, slightly open the windows for ventilation to ensure clear visibility, then find a safe place to inspect or repair the vehicle.
I've personally experienced this issue before. Once, the air conditioning suddenly stopped blowing air, and after checking, I found it was just a blown fuse—a minor problem fixed by replacing it. Stuck blowers or motor failures are also not uncommon; if the fan doesn't spin, there's naturally no air. Poor contact in the switch or control knob often happens in older cars, where pressing the switch gets no response. Incorrect automatic AC settings could also be the culprit, like selecting recirculation mode but forgetting to adjust the fan speed. My advice is to first check the fuse box location yourself and refer to the manual to find and replace the corresponding fuse. If it's a fan speed selection issue, try turning up the speed. On a related note, frequent use of the AC system can lead to aging, so during regular maintenance, have a technician inspect the ventilation components to keep the system running smoothly.
