I have had this exp. Before it happened to me my temp gauge never went above half way, then it started freaking out and I was like wtf?!
I noticed I had a lot of leaking around the top radiator/engine exchange hose (forget if this is the pumping into or out of the engine). Anyway, I emptied all of the radiator (letting the car cool down first of couse fully fully) then put new worm clamps on the hoses lower and upper, cleaned the hoses, flushed the radiator, ran about a couple quarts through of pure 1/2 ethelene glycol and distilled water. Torqued the plug, cleaned the contacts, filled up the radiator, etc. Never had a single prob since.
hope this helps
L
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