How much fuel does a car consume when idling with the air conditioning on for one hour?

1 Answers
JeremiahAnn
07/30/25 5:30am
When a car idles with the air conditioning on for one hour, it consumes approximately 2 liters of fuel. The engine's operation primarily maintains the functioning of the air conditioning compressor, water pump, oil pump, flywheel, etc. If the clutch is engaged (the clutch pedal is not pressed), the engine also drives the gears of the transmission input shaft and other components, making idling quite fuel-intensive. Below are some methods to reduce fuel consumption: 1. Check the air conditioning system in summer: Air conditioning malfunctions are a significant cause of high fuel consumption. Poor cooling performance may lead to increased fan speed and lower temperature settings to achieve a comfortable cooling effect. 2. Frequent hard braking: Frequent hard braking is a major factor contributing to high fuel consumption. While ensuring safe driving, make full use of the vehicle's inertia. 3. Avoid excessive air conditioning in small-displacement cars: For vehicles exposed to the sun, avoid turning on the air conditioning immediately after entering. First, open the windows and set the fan to a higher speed without turning on the air conditioning to expel the hot air inside. Once the car has cooled down moderately, then turn on the air conditioning.
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