The radiator cap maintains proper pressure in the cooling system, allowing coolant to circulate efficiently and prevent overheating. A faulty cap can cause coolant leaks, steam from the engine, or elevated temperature readings. It’s important to inspect the cap for cracks or worn seals and replace it if it doesn’t hold pressure. Most caps are rated for a specific pressure level, so using the correct replacement is essential. Replacing the cap is a simple, low-cost task that can prevent costly engine damage. Always allow the engine to cool before removing the cap to avoid burns. Regular checks during maintenance help ensure your cooling system operates safely and effectively.