2003 Dodge Caravan oil in radiator (fix)

I just purchased a 2003 dodge caravan, it drives very well but my only problem is that I had oil in the coolent (radiator). I had the radiator replaced and its not leaking yet. I was told that the radiator had a hole we're the oil is entering. My question is how do I know if it wasn't my head gasket that was blown. What are the signs? Van runs fine been waiting for it to leak out but no signs yet.