Fluid coming out of radiator cap

Good afternoon.

The fluid may be leaking from a bad radiator cap. Try this first. It may take care of it.

Beyond that, you would need to have the head gaskets checked for leaking. You could get a chemical kit at a parts store to test for hydrocarbons in the coolant which would indicate a failed head gasket.

Roy

https://www.2carpros.com/articles/head-gasket-blown-test