If you left your car running with the heat on full blast for an extended period of time, such as overnight, it is likely that the interior of your car would become extremely hot. This could potentially cause damage to the interior of your car, such as warping or melting plastic parts, or causing the seats or upholstery to become discolored or damaged. Additionally, leaving your car running with the heat on full blast for an extended period of time would waste a significant amount of fuel, and could potentially be a safety hazard if the car were to catch fire or if carbon monoxide were to build up inside the car. It is generally not recommended to leave your car running with the heat on full blast for an extended period of time.
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