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The thing I don't understand is why this all occurred after I had the coolant topped off.

one of the jockeys may have jostled the fans or might just be Murphys law. An non mechanic acquaintance ran into this recently when he has something done & they hooked the fan wiring up backwards, evidently they are polarity sensitive & it was pushing or pulling the air the wrong way

live every 24 hour block of time like it's your last day on earth