What happens if coolant cap is not put on correctly?

If the coolant cap is not put on correctly, it can lead to coolant leaks, resulting in reduced coolant levels and potential overheating of the engine. Additionally, improper sealing can allow air to enter the cooling system, which may cause air pockets and disrupt the flow of coolant. This can lead to decreased engine performance and possible damage if not addressed promptly. Regularly checking the coolant cap for proper fit is essential for maintaining an efficient cooling system.