How did you flush the cooling system?
On many cars now, the system actually needs filled under pressure to completely fill it up if you've emptied it completely (i.e. if you truly flushed it, not just if you add coolant when it's low). I wonder if, when the water pump was replaced, if it was never filled correctly, or all the way.
I'm assuming you've regularly checked the coolant during this time period? Has it always been completely full?
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