What might cause bmw f30 coolant leak?

If You notice Your BMW F30 leaking coolant then it is something that You should address as soon as possible. A coolant leak can lead to low coolant levels which can overheat Your engine. The most common reason that You will have a coolant leak is from one of the hoses. They attach to the radiator and engine using hose clamps and if any of these come loose the system will leak from them. There is also a possibility that a rubber hose has dried out too much and cracked and is leaking in Your engine bay. If neither of these are the problem then You will want to inspect the radiator for signs of damage or being cracked.