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Silicate drop out, the coolants been in the system for too long and is "spent." Do a search on it, turns into yellow crust over time. Usually kills the water pump if left unchanged for too long.
Originally Posted by zetosan
Hey man did you figure out what the yellow substances were? cause my thermostat gave up and i was changing and did a coolant flush and i also saw the yellow stuffs in the radiator through the cap. you think its anything to be worried about?
