In most cases, it is not possible to run an air conditioner (AC) without turning off the engine of a vehicle. The AC system in a vehicle is typically powered by the engine's mechanical energy, and it requires the engine to be running to operate.
Here's why:
Power source: The AC compressor, which is responsible for compressing and circulating the refrigerant in the AC system, is driven by a belt connected to the engine. The compressor requires the rotational power generated by the engine to operate effectively. When the engine is turned off, the compressor will not receive power, and the AC system will not function.
Electrical system: The AC system in a vehicle also relies on the electrical system of the vehicle to operate various components, such as the blower motor, controls, and sensors. The electrical system draws power from the battery, which is charged by the alternator when the engine is running. If the engine is turned off, there will be no power supply to support the AC's electrical components.
It's worth noting that some vehicles may have auxiliary power features that allow certain electrical systems, including the AC, to operate for a limited time when the engine is off. These features are typically designed to provide temporary cooling or comfort, but they are not intended for extended use or to replace the AC system's full functionality.
In summary, to run the air conditioner in a vehicle, it is necessary to have the engine running to power the AC compressor and provide electrical power to the system.