Black sediment in coolant
I just changed the thermostat, housing, upper and lower radiator hoses and when I drained the system I had a black sediment in the coolant that I drained. I'm guessing that it is from the hoses breaking down but not sure?
The vehicle in an 05 WK 4.7L with 120K miles. I did a flush and refill at 105K miles so the coolant is relatively new. The water pump was replaced at 70k miles and I reused the coolant that I removed. They are the only two coolant related maintenance that has been performed. Any thoughts on what the sediment is???
The hoses would be my guess. They are probably still OK, but inspecting the insides should confirm. When I flush a system I prefer to use an additive that takes several days of driving to clean the system, then flush with plain water through several warm up cycles until everything runs clear.
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