Non-Rover coolant sludge

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Author Message   Kyle Beckman (Kbeckman) Member Username: Kbeckman Post Number: 46 Registered: 02-2002 Posted on Monday, June 30, 2003 - 10:27 pm:    A buddy of mine has a '97 Oldsmobile Bravada that has sludge in the coolant. He says that he has flushed the coolant system but the sludge has come back. He's using GM Dex-Cool anti-freeze. I've never heard of sludge in the coolant system before. Anyone have any ideas as to the cause and what to do about it?   Greg Hirst (Gregh) Member Username: Gregh Post Number: 241 Registered: 10-2002 Posted on Monday, June 30, 2003 - 10:45 pm:    Sounds like electrolytic (galvanic) corrosion. Does he have an electric short someplace? Also, is he using distilled water?   Kyle Beckman (Kbeckman) Member Username: Kbeckman Post Number: 47 Registered: 02-2002 Posted on Monday, June 30, 2003 - 11:08 pm:    Greg, I did some checking on the internet and this seems to be a common problem with some GM vehicles. It's related to the coolant system not staying air tight, such as with a bad radiator cap. The coolant turns acidic. Kyle