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There are a few things that foul coolant. Grey stuff in coolant is usually a stop-leak additive, especially if any of it is solid or sludgy. The heaviest buildup is usually around radiator cap. I suspect your car leaked (or still leaks) coolant somewhere, and one of its owners or "mechanics" decided to use a stop-leak additive to fix the leak. This is ...


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Check the left side (as you sit in the vehicle) of the radiator. It will be at the bottom and possibly hidden by the plastic fan shroud. It may look like a wing nut shaped plug or a conventional petcock.



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