97 Taurus Heater core

My car has approx 60,000 orginal miles. Tomorrow I will take it in for the 5th heater (leaking) core replacment(2 paid by ford and 3 at my expence). Has anyone else had this problem and/or do you know of permanent fix. The
current core is only 5 to 6 months old. All replacement were ford parts.

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