There is usually a reason for an occasional coolant loss but that isn't often obvious and it is necessary to monitor the situation, sometimes for a considerable time, while the fault develops or doesn't...
Water pumps sometimes leak sporadically before the seal finally fails - or doesn't. Occasionally a head gasket might release a larger bubble of gas than usual and displace coolant through the overflow or a similar result from a temporary blockage of the degassing circuit...
SOURCE: Need to reset LOW COOLANT light on 2000 Chevy Silverado 1500
Try pumping the brakes 3 or 4 times with the truck running in 'park'.
SOURCE: My coolant light on my 96 chevy cavalier came on.
have the cooling system checked with a pressure test. to see if it will hold, if not you know you have a leak to find
SOURCE: Audi A4 2.5 V6 TDI - Creamy grey coolant in expansion tank
Sounds like blown head gasket (or worse) still to me.
Remove oil filler cap and look for grey oil.
Never use water these days but special coolant. Water makes vapour spots and cause block cracks, worse then blown gaskets!!!
vapour does not cool very well.
Look like you have cracks already.
Take a compression test if possible. But might not show op at that temperature.
The gauge indication troubles me.
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