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Rent a pressure tester from chinazone...while you're there buy a new cap if you haven't already. If your system doesn't hold pressure the coolant will boil making the temp unstable to say the least. I think a 50/50 mix has a boiling temp of 22x*...don't remember the exact number. With 18 lbs it's raised to 270+.

It could also be the pump but if it's not showing any signs that's probably not it.
 
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