Does idling with the air conditioning on in summer harm the car?
2 Answers
Idling with the air conditioning on does not harm the car, but it does cause normal wear and tear. Below are the effects of idling with the air conditioning on: Increased emission of harmful gases: Idling with the air conditioning on produces more harmful exhaust gases compared to driving with the air conditioning on. This is because idling is the most unfavorable operating condition for the engine, where gasoline combustion is relatively incomplete, leading to higher emissions of harmful gases such as carbon monoxide, hydrocarbons, and nitrogen oxides. Greater harm to human health: Idling with the air conditioning on can pose serious risks to occupants, even fatal, if not handled properly. There are two main types of harm: hypoxia (oxygen deprivation) and carbon monoxide poisoning. When idling with the air conditioning on, it is essential to be in an open area. Never stay in the car for extended periods in a confined or enclosed space, as the carbon monoxide emitted by the car can enter the cabin, increasing the risk of carbon monoxide poisoning.
As someone who has driven for over a decade, I feel compelled to warn everyone about idling with the AC on during summer. Last summer, while waiting in scorching heat, I idled with the AC running for half an hour to cool off. Afterwards, the engine noise became noticeably louder. A mechanic later diagnosed worn spark plugs and piston rings—caused by excessive compressor load during idling, which also leads to engine overheating and carbon buildup. High ambient temperatures in summer worsen heat dissipation. Prolonged idling not only wastes fuel but can also damage the battery. I now limit it to 10 minutes before shutting off the engine or simply step out for fresh air with the windows down. New cars might barely handle it, but older vehicles absolutely shouldn’t risk it—costly repairs and maintenance headaches aren’t worth it.
