What Impact Does Idling with Air Conditioning Have on the Engine?

[Serenity]

Idling with air conditioning can cause certain wear and tear on the engine, potentially shortening the maintenance cycle. Below is an introduction related to the engine: 1. Introduction: An engine is a machine capable of converting non-mechanical energy into mechanical energy. 2. Classification: Includes internal combustion engines (reciprocating piston engines), external combustion engines (such as Stirling engines, steam engines, etc.), jet engines, electric motors, and more. 3. External Combustion Engine: An external combustion engine means the fuel burns outside the engine. 4. Internal Combustion Engine: An internal combustion engine, or reciprocating piston engine, differs most from an external combustion engine in that the fuel burns inside it. There are many types of internal combustion engines, with common gasoline and diesel engines being typical examples.

[LeCali]

I'm quite qualified to speak on this matter, as I often take naps with the AC on during long-distance drives at service areas. When the engine idles to power the air conditioning compressor, incomplete fuel combustion easily leads to carbon buildup. Two months ago, I opened up my engine and saw black sludge accumulated behind the throttle valve. Moreover, modern cars' auto start-stop systems won't engage when the AC is running, causing rapid battery drain. Last time I forgot to turn off the AC for two hours, it completely killed my battery. My advice is not to run the AC for more than half an hour in summer - otherwise, the repair costs could equal half a year's fuel expenses. For extended parking with cooling needs, ride-hailing drivers like us have switched to using car-mounted mini fans, which are far more worry-free than AC systems.

[StJaxon]

Last time I took my daughter to the zoo, I waited in the parking lot with the AC on for forty minutes in 38-degree heat. When I got home, I noticed the fuel consumption gauge showed an extra 1.8 liters, which works out to over three yuan in extra fuel costs every ten minutes. Nowadays, cars with high idle fuel consumption also tend to overheat easily. I’ve read repair manuals saying the cooling system doesn’t circulate well in these conditions, and it’s painful to watch the cooling fan whirring away. Older models are especially prone to overheating—just last week, my neighbor’s decade-old car had a radiator burst because of this. I’ve since wised up: when taking the kids out, I look for underground parking at shopping malls. It’s cooler and doesn’t strain the car—a win-win.

[StKendra]

The most extreme case I've seen in auto repair was an owner who kept the AC on all night during summer while sleeping in the car. Three months later, the engine's carbon buildup completely clogged the exhaust pipe. With China VI vehicles equipped with particulate filters, it's even worse now. Idling with AC on leads to insufficient exhaust temperatures, causing the filter to clog worse than an old range hood. Last week, a brand-new car with only 8,000 km on it had its malfunction indicator light come on. Upon disassembly, particulate matter was flaking off like snow. So folks, especially new car owners, don't ruin your beloved vehicle just to stay cool.

[LeZoey]

Hybrid car owners find this issue even more frustrating. When the air conditioning is on, the engine frequently starts to charge, burning fuel when pure electric power could suffice. Last week, I tried watching a show in the car with the AC on, and the battery dropped from 70% to the forced engine start, with the engine starting and stopping six times like hiccups. Now, I remotely start the AC via my phone five minutes before getting in the car—it's both cool and saves the engine's lifespan. Technology really changes life.

[Antonio]

A decade-long auto mechanic reminds us of several hidden wear and tear issues: Continuous compressor operation wears out sealing rings, with the most frequently replaced model last year losing all refrigerant in just three months; prolonged battery discharge leads to plate sulfation—23 dead batteries I've handled were all caused by idling with AC on; the pulley system's extra load accelerates aging, with some owners replacing their alternator belts three times. It's recommended to switch to external air circulation when using AC for better efficiency, or install a solar-powered vent fan, which is far more cost-effective than running the AC hard.