Coolant leak need opinion

[645i]

My 00 4.4 just blew coolant all over the left side of the engine for the most part, the weird thing no hoses actually blew. I drove the car back home and popped the hood to see where the steam was coming from. It was coming from the top hose connection, the hose is good it was replaced when I did the upper timing chain cover seals and water pump. Since no hoses actually burst could this issue be caused by the radiator being bad. It is the original radiator 167k miles or the T-stat, I am not sure which way the coolant flows through the radiator. Thanks in advance for any help