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Sounds like classic head gasket unfortunately.
My Mom had an Oldsmobile with that Quad 4 thingie and you'd drive along just ho-hum, all of the sudden coolant steam rolling out from under the hood everywhere, pull over pop the hood and then nothing. Coolant was leaking from the head gasket to the outside of the head, just dropping back a couple degrees in temp would seal it right up again...no coolant anywhere to be found. Weirdest failure mode ever and confirmed by the GM dealer.
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'84 Carrera Coupe
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