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Old 02-23-2013, 07:41 PM
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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???
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Old 02-24-2013, 01:57 AM
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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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