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What is the thick sludge under the engine coolant cap?

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If you are using the red,Dexcool, antifreeze it is a biproduct of oi mixing with air in the cooling system. You need to get a professional to clean and flush the system. Then use the green antifreeze. There is currently a class action suit in regards to Dexcool.

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First answer by Debrouxauto. Last edit by Debrouxauto. Contributor trust: 69 [recommend contributor]. Question popularity: 1 [recommend question]

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Answers.com > Wiki Answers > Categories > Cars and Vehicles > Parts and Repairs > Heating AC and Engine Cooling > Antifreeze and Engine Coolant > What is the thick sludge under the engine coolant cap?

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