still have diesel in coolant
I had the cups replaced in my wife excursion. The shop flushed the coolant once before we got it back. I then pulled the thermostat, flushed 4 times by draining the block by pulling the lower plugs and the radiator hose. I used cascade dish soap on the first two flushes. I put it back together between flushes and drove to get it hot. After putting it all back together filled with coolant mix and it was very clear. Now I am seeing diesel in the coolant again. I called the shop and was told it is most likely residual diesel that was not flushed. It is not acting like it was when the cups were leaking, then it had a hard time starting. How the hell do I get the diesel out of the coolant. I am not sure what else to do and am getting frustrated!