Is It Harmful to Run the Air Conditioner While the Car Is Parked and Idling?
2 Answers
Running the air conditioner or other electrical devices (such as multimedia systems, headlights, cigarette lighters, or phone chargers) while the car is parked and turned off can overload the battery. Over time, this can easily lead to battery depletion, difficulty starting the engine, and even damage to the battery. In this state, the battery is essentially being drained without any benefit, which is not worth the cost. Common mistakes when using the air conditioner in summer: 1. Turning on the AC immediately after starting the engine: This increases the engine load and can cause long-term damage. Additionally, turning on the AC when the car's interior is very hot makes it harder to cool down quickly. 2. Running the AC while idling in traffic or waiting: This places a heavy burden on the engine, which operates inefficiently at idle. Incomplete fuel combustion produces high levels of carbon monoxide, which can enter the cabin if ventilation is poor, posing a poisoning risk. 3. Setting the temperature too low: Prolonged exposure to very cold air can lead to health issues like arthritis, frozen shoulder, or colds. Direct airflow to the face for extended periods may even cause facial paralysis. 4. Using recirculation mode continuously: This causes cabin air to become stale and can lead to dizziness or oxygen deprivation. 5. Directing airflow straight at occupants: Cold air tends to sink, while warm air rises. Blowing cold air directly at people concentrates it in the lower cabin, preventing proper air circulation and making the environment feel stuffy and hot. 6. Not turning off the AC before shutting down the engine: This creates two problems: First, the next engine start will occur under the additional load of the AC system, straining the engine. Second, moisture can accumulate in the AC ducts and vents, promoting bacterial growth and odors over time. 7. Not using the AC for long periods: Extended disuse can cause the compressor to lose lubrication, potentially leading to leaks in the system.
Parking with the engine running and the AC on does pose potential risks. The most common danger is exhaust gas poisoning. When the engine is running, tailpipe emissions contain carbon monoxide, which is colorless and odorless but can be fatal in enclosed spaces like garages. I've heard of cases where people fell asleep while waiting in underground parking lots and ended up unconscious—fortunately, they were discovered in time. If the vehicle's AC system has air leaks, exhaust fumes can more easily seep into the cabin. For safety, avoid idling with the AC on indoors or in poorly ventilated areas. If you must do so, choose an open outdoor location and at least crack a window to maintain airflow. Also, avoid prolonged idling, as it can worsen engine carbon buildup and, over time, shorten the vehicle's lifespan.
