Pretty much what everyone said above. Your cooling system was already marginal. After the EGR mod this problem just became more apparent. Just follow through the recommended procedures to place the cooling system back into optimum performance.
As preventive maintenance I am replacing my radiator with a brand new, steel reinforced necked, Behr radiator already in my garage.
There are a few things worth repairing, or completely replacing, before it's completely broke...
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