These these engine seem to have issues with hoses to in general. Glad you found it, nothing worse chasing a problem that seemingly should occur.Have finally sorted my heating issues. Turns out I had rubber like a bike tube blocking water ports in heads and block . had heads checked and no cracks or blown gaskets. Was causing pressure bild up in water system and pushing water out off overflow then gets hot now I just need to sort out my electric problems and she will be all good. Tips don't use cheap radiator hoses the inner skin could peel off and push through water system. I never did so I'm not sure where it come from.