Will a Car Start or Run Without a Serpentine Belt
A broken or missing serpentine belt raises an immediate question for many drivers: will a car start without a serpentine belt? The short answer is usually yes, because the starter motor draws power from the battery to crank the engine independently of that accessory drive belt. However, the vehicle should not be driven this way. Once the engine is running, the ribbed belt powers the alternator, water pump, power steering and air conditioning. Losing it quickly changes a simple mechanical question into a fast-developing operational problem that affects charging, cooling and steering control.
Essential answer
Most gasoline and diesel engines will still crank and fire when the serpentine belt is missing, torn or thrown off a pulley. The starter acts directly on the flywheel or flexplate, so a broken belt does not interrupt ignition during the initial start. A short start may work, but that does not mean the car is safe or practical to run. The belt path around the tensioner, idler pulley and accessory pulley is essential only after combustion has begun and the engine needs those driven components to keep operating correctly.
Running a car without the belt can work briefly in limited circumstances, but it rapidly drains the battery because the alternator is no longer turning. On many engines the water pump is also belt-driven, so coolant stops circulating and the temperature gauge can climb within minutes. If the same pulley drives the power steering pump, steering effort becomes heavy. The direct answer is therefore qualified: it may start, but it cannot run long or far without risking overheating, electrical failure and loss of power assist.