First early clues are, heater cools ( when on hot ) at idle ( poor circulation ), water loss, if the water in the bottle smells of fumes, mayo substance in the oil, girgling noise in the water system, excess steam from rear, when first started you hear water rush through the heater system inside the car, basically the main problem with these was lack of proper maintence ( including dealers ), any of them could be a indication, once the temp guage goes to the red it's usally to late
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