Yup its a sealed system. If there isn't a cooling system leak, the only way for coolant to really escape is if you overheated the engine causing the overflow tank to, overflow! It will actually dump right on the ground through a dump tube when it reaches capacity.
Isnt the low line on the reservoir just the cold fill line? I was going to double check and look at mine but my reservoir is currently MIA (car in a million pieces).
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