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I had the same problem - turned out to be a combination of the fan sensor needing to be replaced as well as the reservoir tank cap needing to be replaced as well. No problems since then.
Well when my car started to leak coolant like a faucet it turned out to be the reservoir cap and I just replaced it, but my car didn't die at all while this was going on
You answered his question. It died because he has other issues.
Keep this in mind "Valve float."