How much fuel does a 1.5t car consume when running the AC overnight?

[HarmonyMarie]

1.5t car running the AC overnight, depending on the vehicle's displacement, generally consumes over 10 liters of fuel. Additional information is as follows: 1. Engine: The engine's operation mainly maintains the functioning of the air conditioning compressor, water pump, oil pump, flywheel, etc. If the clutch is engaged (clutch pedal not pressed), the engine also needs to drive components like the transmission input shaft gears. 2. Engine idling: Engine idling also consumes a significant amount of fuel. If idling only drives the air conditioning compressor, more energy is wasted, and the engine remains at high temperatures for extended periods, potentially leading to carbon dioxide buildup.

[LaOmar]

Hey, as someone who frequently tinkers with cars, I know a thing or two about running the AC overnight in a 1.5T vehicle. Generally speaking, when idling with the AC on, the engine RPM increases to power the compressor, consuming approximately 0.8 to 1.5 liters of fuel per hour. Assuming you run it for about 8 hours overnight, total fuel consumption could range from 6.4 to 12 liters. The exact figure depends on the car's age and condition: newer models like the Honda Civic might be more fuel-efficient, while older ones like the Geely Boyue could guzzle more. Temperature settings also play a crucial role—running high cooling in summer consumes significantly more fuel than using the heater in winter. The AC compressor is a real fuel hog; I've tested it on my own 1.5T car, and during hot weather, leaving it on overnight can drain nearly a small fuel canister's worth, around 10 liters. Not only is this wasteful, but it can also lead to carbon buildup and engine damage. I’d advise against doing this often. If you really want to save fuel, turn off the AC before shutting down the engine when parked in a safe spot. Safety first—never let exhaust fumes accumulate in an enclosed space.

[DelLandon]

I've driven a 1.5T compact car like the Changan CS75 for several years, and I've had plenty of experiences leaving the AC on overnight. Fuel consumption mainly depends on the environment and operation: during hot summers when the AC is running at full blast, consuming about 1 liter of fuel per hour is normal, totaling around 8 liters over eight hours. The engine doesn't use much fuel at idle, but once the compressor kicks in, it burns extra fuel, adding a small load. Older cars consume more fuel—my older model could go up to 1.2 liters per hour, while a brand-new car might drop to 0.7 liters. Don't forget that a dirty AC filter increases the load; cleaning it annually can save some money. Overall, if the average overnight fuel consumption is around 9 liters, at the current fuel price of 7 yuan per liter, that's 63 yuan spent. And that's not counting wear and tear, so if you need to take a break during a trip, switching to recirculation mode and opening the windows for ventilation can reduce energy consumption. Safety-wise, remember not to do this in an enclosed garage—preventing exhaust poisoning is crucial.

[DavidFitz]

For a 1.5T car running the AC overnight, fuel consumption isn’t hard to estimate. Under normal idling conditions, the AC consumes about 0.8 liters of fuel per hour. Assuming 7 hours overnight, that’s 5.6 to 6 liters—enough to drink half a small bottle of mineral water. If the car is older or the AC is set too low, it might jump to 10 liters. I’ve tested it: fuel consumption is more noticeable when the car’s temperature is high. In real driving, this not only wastes fuel but also accumulates dust, shortening engine life. A money-saving tip is to turn off the AC after parking and open the windows for ventilation. The fuel consumption may seem small, but it adds up and isn’t worth it—don’t make it a habit.