hi how are things.
What I can tell you is that perhaps you are confusing one fault with the other. If you walked with little water in the refrigeration system and this is the cause of a failure you must have reflected in the temperature sensor of the board should rise a lot, which you have not named. If you allude that the fault can be an engine reheating you have to present other symptoms to think about example, high water temperature revalue from water due to Spanish pond and already more serious the engine does not start.
What I think can be the failure that happens in these vehicles is the ignition module this presents a symptom as you name it, the engine starts well but on certain occasions it stops, you wait for a while you turn it on again and part again and then it stops again.
Verify it and tell us results
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