still leaking antifreeze from radiator cap

[X_5]

I change the expansion tank and the cap but I getting a leak at the cap. What could be causing the antifreeze from leaking at the cap?

[X_5]

could it be from air still in the system? Or a new cap bad?

[Bloody-Brit]

Is the system overfilled? Too much coolant can cause a leak at the cap when warm until the excess is gone and the system can pressure up properly.

[admranger]

Bad cap. Warped neck on reservior. Bad headgasket.