I just did this job a couple of months ago, used DI water for the flush, took 4 times to get the water clear. Cummins states the Total Dissolved Solids to be below 140 if I remember right..........Also, after reading/studying up on the task on here, and some PM'ing "Spike45" (Retired Cummins Engineer") I bought 2 gallons of the "Consecrate" final charge, after the flushing was good, I added the consecrate (2 Gallons) to the system, as there is a lot of water left behind in the system after draining. Make sure to turn on the dash heat to enable the old coolant in the heater hoses to be circulated out. Then I added the 50/50 mixture to fill the rest of the system.
I drove the Coach between flushes.............
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2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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