What is a potential consequence of running an engine with a faulty radiator cap?

A faulty radiator cap can lead to engine overheating because it plays a critical role in maintaining the pressure in the cooling system. The radiator cap is designed to seal the cooling system, allowing it to build pressure and raise the boiling point of the coolant. If the cap is defective or leaking, it can result in a loss of pressure, causing the coolant to boil at a lower temperature and potentially leading to overheating.

When the engine overheats, it may cause various issues such as damage to engine components, warped heads, or even complete engine failure if not addressed promptly. This highlights the importance of a properly functioning radiator cap in ensuring the cooling system operates efficiently and maintains optimal engine temperatures.