Radiator fluid coming out of the overflow cap?

Hello,

Is your engine overheating?
Usually the coolant will come out of the radiator cap when the engine overheats.
Since you changed the cap, overheating might be the reason coolant is coming out of the cap.
An engine can over heat for various reasons.
It could be a stuck thermostat, faulty water pump, bad radiator, in operative cooling fans.
Any of these can trigger the engine to overheat.

Remember to work on the engine when it is cold.

You might find these articles helpful:

https://www.2carpros.com/articles/engine-cooling-system

https://www.2carpros.com/articles/symptoms-of-a-bad-water-pump
https://www.2carpros.com/articles/how-an-engine-thermostat-works

I have attached diagrams for your reference.

Please let me know of any questions.

Thank you.