1998 Contour overheating

I just had a new waterpump installed by a local shop as the impeller had blown up as they do being made out of a composite. But it still overheats a bit. Not a lot but higher than it ran before. I am wondering if the shop got all the pieces out of the thermostat and or the radiator and hoses. It just acts like a plugged up radiator.But was fine before the repair. Any ideas? Also any ideas how to get the pieces out if that is the case? Dale It is the v6 motor I forgot to mention

Id say its possible some of the pieces of the impellar could be lodged in the plumbing.

Did they flush the coolant?