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945T Coolant Brown, Black Sludge Under Coolant Reservoir Cap. Thoughts? Flushing Advice? 900 1993

The head gasket didn't show any obvious signs of leaking. I used a nozzle on the end of the hose and wedged it into a heater core hose. I covered the other end so it increased pressure in the system, I flushed the radiator separately, and recently flushed the oil cooler. They all still looked gross. Blackish water came out. I wish I had an after market oil cooler. This one is bolted up to the block as an extension of the oil filter adapter.

Does it make sense for it to be the oil cooler? I'm considering removing it and hooking up water to it and checking for leaks.






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