I remember your other thread. So you drove back from NYC to Miami with a coolant leak, never bothering even to top it off. Your lucky you even made it. But that is besides the point.

It still sounds to me most like a blown head gasket...

But they should be able to give you a good explanation of what is wrong.
That sucks that you have got 3 half ass descriptions of failure. Maybe read the paperwork and see if anything is noted in there?
Sounds like you need to pick better shops, night cost more but you might get competent answers and troubleshooting.

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