Join Date: Jan 2015
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I'm no expert but I would think as part of a water pump replacement under warranty if the coolant had signs of water pump impeller or block metal debris in it this would require the coolant be drained, the system flushed, and then refilled with fresh coolant.
Even with no professional auto mech training/education when I replaced a water pump in a car and I did a fair number of these if I saw signs of water pump impeller contact with the block if I say any signs of debris in the drained coolant I would have thoroughly back flushed the cooling system before installing the new water pump and T-stat.
I would argue that in not doing this constitutes a to put it bluntly a half ass repair that leaves the engine and its cooling system more prone to problems like overheating or premature water pump seal failure, possibly even catastrophic engine failure.
The dealer owes you are a reasonable degree of care, skill, and experience in working on your car. To return the car to you with debris from a failed water pump in the coolant is clearly a sign you didn't get the reasonable degree of skill, care and experienced to which were you entitled.