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Why not to mix different kinds of coolant


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This unit came in with the complaint of oil in the coolant. After further inspection it was determined two kinds of coolant were mixed in and ran forever. This stuff is like gelatin and is packed in every cooling passage you could think of. Day two of flushing is started and its still pushing gunk out.

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Not sure what the application is on this beast, but Ill bet the heater core and radiator are toast!! Being how black it is, could it be a possibility of oil being mixed into the coolant as well? Even just antifreeze I dont think would turn black like that, but I have been wrong many times before.

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I know of a guy that had a GM vehicle that had the same thing happen. The previous owner (or somebody) mixed Dex with the green stuff and he had the same problem.

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Believe it or not 30 min. of flushing the egr cooler and heater core cleaned them up. The radiator was sent out and had the tanks pulled off to be flushed. Not a drop would come out of the radiator it was so packed. With the clutch replacent its already at $6k but , Monday will tell if it's going to flush completely. I've got a nice big box of lemon scented Cascade ready to do some work. As for overheating....only 2 counts of 230-240, way less than I was expecting.

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