Brown/tan "mud" in bottom of coolant reservoir - Maintenance/Repairs - Car Talk Community
Found dark particles in the coolant reservoir. Its an old 90s blazer. Is something to be expected or something to worry about? Thank you!! : r/MechanicAdvice
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Someone glitter bombed the coolant reservoir, causing all sorts of problems. : r/Justrolledintotheshop
Brown substance in coolant tank | Mercedes-Benz Forum
What is this crap in my coolant reservoir? - BMW 3-Series (E90 E92) Forum
What caused the coolant to do this? : r/MechanicAdvice
Never had a cooling system foam before : r/Justrolledintotheshop
