* Carbon monoxide poisoning: This is the biggest risk. Carbon monoxide is a colorless, odorless, and deadly gas produced by the engine's exhaust. Even a small leak can build up to lethal levels inside a closed vehicle overnight.
* Asphyxiation: Even without a direct leak, the car's limited oxygen supply will be depleted, leading to asphyxiation.
* Fuel exhaustion: Running the engine all night will deplete your fuel supply.
* Vehicle damage: Continuously running the engine can put extra stress on various components and potentially lead to damage.
* Legal issues: Depending on your location, leaving a car running unattended might be illegal.
* Theft: A running car is an attractive target for theft.
If you need to stay warm or cool overnight in your car, use alternative methods like a portable heater (ensure proper ventilation if using this!) or blankets. If you're facing a genuine emergency, find a safe, well-ventilated place to sleep, such as a 24-hour gas station or shelter.
