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I have seen this a few times in the past [worked in repair shops for 13 years] it is caused by some types of stop leak / water pump lube. There is probably nothing wrong. I would either take it to a shop and have a radiator flush and new anti-freeze put in; or purchase a flushing “T” at an auto parts store. These do a good job and it is very easy to do. The only drawback is that you make a mess flushing it yourself. Either way do not put in any additives other than good quality anti-freeze.
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