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Something is causing the temps to shoot up. Are the cooling fans for each rad operating? Can you hear them? They should be kicking on if the temp guage goes where you are describing. Also do you have the new version coolant cap? There might be an air bubble in the system and thats a serious problem. It can cause specific heating to delicate parts of the engine and lead to all kinds of nasty issues. If the WP and T-stat are working and the fans are coming on thats where I would start. Also have the front rads been cleaned out? You'd be AMAZED at the junk that collects in there basically choking the air flow to the rads. If you have an air bubble thats an easy fix that can be done with or without a pressure tester.
Good luck..
m2
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