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...does that have one of those cooling systems with an "air/bubble" vent value somewhere on the engine? What your mechanic friend described sounds like it does.
...the vent value is typically located at the "highest" spot in the engine/radiator location with todays' "low" engine designs. The vent value is used to "expel" any air bubbles that remain in the cooling system after a coolant cleaning, exchange or flush. Today's coolant systems don't tolerate "air bubbles" very well (localized 'hot spots').
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