Does Manual AC Setting Affect Fuel Consumption?

[LaVivienne]

Manual AC settings have minimal impact on fuel consumption. The core component of the AC system is the compressor, which is connected to the engine crankshaft via a belt. When the AC is off, the compressor pulley idles; when activated, the compressor engages, consuming engine power and increasing fuel usage. Behind the dashboard lies a heat exchanger with an accompanying fan. Since fan speed variations don't alter cooling capacity, they hardly affect engine fuel consumption. Key considerations for car AC usage: 1. Avoid minimum temperature settings: Many drivers excessively lower cabin temperature in hot weather, forcing continuous operation of the AC pump and blower. This not only increases fuel consumption and accelerates vehicle wear but also generates harmful emissions affecting occupant health. 2. Limit electrical device usage: Simultaneous operation of multiple in-car electronics can exceed 1KW power draw - nearly matching small cars' AC compressor consumption (typically 1.5KW). This electrical load converts directly into additional engine fuel consumption. Overloading electrical systems also accelerates vehicle deterioration.