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The brownish stuff you are seeing is Iron Oxide from contamination or the coolant was improperly mixed with to much water in the past at some point..
90's blazer's had Dex coolant contamination problems supposedly due to the angle the cap is mounted to the radiator..
From what I remember the fix for it was a better sealing Stanton cap..
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2002 Z/28 = Firemutt Racing 370 w/ Cam, Trick Flow heads, TPIS 90mm Intake & 90mm T.B., Vigilante 3600 t.c., Michael's Transmissions Built 4L60E.
QTP Headers, Mufflex Stainless Y-pipe, Pypes Performance Exhaust, Moser 12-bolt w/ 33 spline axles,Truetrac & 3:73's., Spohn.
Cartek Tuned...
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