I noticed a new water pump on my truck when I bought it and a few days back I got a low coolant light. It wasn't too low, just enough to trigger the light going down hill hitting the brakes. Never did it again that day. I checked it the next morning and topped it off. There was a lot of brass/copper shavings in the reservoir stuck to the cap, floating about. It looks like they might not have flushed the system well enough when they did the water pump swap (hopefully it is not new shavings from something else).
What is the proper way to really flush this thing out and get it clean? Do I HAVE to take it to a radiator shop for a flush or can I do it well enough? I know it is not supposed to have bits floating about, but they are very small (just a lot of them) so do you think this will be an immediate issue? It's not really like having metal in the oil scraping the cylinders. I planned to do it as soon as possible. I guess a hung thermostat would be worst case if the bits affected it somehow?