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Red coolant
Just wondering if any of you folks have run into old red coolant that didn't get changed as it should have. What I have is a nice 97 buick that I can see red sludge in the cooling system. Someone had put green coolant in after red and it shows. (Only 26k miles on the car). Is there a good cleaner that would desolve the sludge without harming the plastic intake manifold?
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