Re: rust in water
What I would do if there was a sudden influx of rust?
I would pull the radiator, turn it upside down and flush as much water through it as I could get. then pull the water pump, check the impeller, and scope down the water jacket in the head and see if you can find where it came from. It takes time for rust to be made, and it takes time for it to break loose. and if you have been running rust inhibitors there should not have been any rust.
Something inside your coolant area has changed, I would try to find out what.
My 2¢
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