my car was blowing out white smoke and mixing antifreeze/oil externally. usually symptoms like this would be a head gasket, but what stunned me is that there was also tranny fluid in with the mixture sitting on top. I know that tranny cooler is in the radiator, but would tranny fluid leak if its a blown head gasket? i don't want to have to change the head gaskets and it not be what is wrong. HELP!