Taurus overheating on 1998 Ford Taurus

I recently replaced the thermostat and the heater core in the 98 Taurus. However, it overheats to the point that water starts boiling out of the reservoir. What are your thoughts on what might be going on? The heat gauge shows the coolant temp to be normal.

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1 answer
This may be a blown headgasket. I would get this checked to see if this is the problem, have a shop check for signs of hydrocarbons in the cooling system.
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