Can the coolant temperature sensor make the car overheat?

Yes, a faulty coolant temperature sensor can contribute to engine overheating. If the sensor provides inaccurate readings, it may cause the engine control unit (ECU) to mismanage the engine's cooling system, either by not activating the cooling fans or by not adjusting fuel delivery appropriately. This can lead to insufficient cooling, resulting in elevated engine temperatures and potential overheating. Regular maintenance and prompt replacement of faulty sensors can help prevent such issues.