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It could be a couple of things. The coolant system could be over full. There could be a clog in the radiator. Or possibly the thermostat but not likely.

also, the Ford coolant tank is pressure sealed, if the cap to the tank has a defective seal, it WILL overflow when you stop your car, or whenever the pressure builds

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Q: What causes a coolant reservoir to overflow in a 2001 Chevy Malibu during operation?
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