Does running the AC while the car is stationary affect the vehicle?

[DeKaylee]

Running the AC while the car is stationary does affect the vehicle. Impact on the engine: If the engine is left idling with the AC on for an extended period, it can have certain negative effects on the engine. The engine control unit will increase the engine speed by approximately 100 RPM to boost air intake, which in turn increases fuel injection and enriches the air-fuel mixture. This adjustment is made by the engine computer to enhance operational stability. However, a richer mixture leads to incomplete combustion of gasoline, resulting in increased carbon deposits during prolonged idling with the AC on, which makes the engine less fuel-efficient. Additionally, to dissipate heat from the AC condenser, the cooling fan will operate continuously. Impact on the cooling and ventilation system: Extended idling with the AC on in poorly ventilated areas or garages can also pose a risk of carbon monoxide poisoning for occupants inside the vehicle.