Engine Coolant Color Change
I had my original coolant drained, system flushed and refilled with Fleetguard ES Compleat OAT coolant. This was done at my local Cummins Coach Care center. I've had work done there and have no iss...
Forum Discussion
Because of the residual water in those long heater lines and heater core, if you want a 50/50 mix, you HAVE to use coolant concentrate, not pre-dilute.
So, after the final rinse (I use distilled water for final rinse) add 13 gallons of concentrate. Top off with distilled water-- you do not really care how many gallons it takes/how many gallons of residual water were in the system.
The only way to properly use pre-dilute is to take off one of the heater hoses and use compressed air to blow out all the water in the lines and heater core. But, that leaves you with a LOT of air to purge from the heater circuit.
So, after the final rinse (I use distilled water for final rinse) add 13 gallons of concentrate. Top off with distilled water-- you do not really care how many gallons it takes/how many gallons of residual water were in the system.
The only way to properly use pre-dilute is to take off one of the heater hoses and use compressed air to blow out all the water in the lines and heater core. But, that leaves you with a LOT of air to purge from the heater circuit.
