[QUOTE=Steamer;49425]Like I wrote: “…claiming it will cause immediate overheating due to its heat transfer characteristics is nonsense.”
Given the history of this problem, overheating may be related to trapped air or a cracked liner or warped head due to severe overheating during the initial incident. If it developed over a longer term and the type of coolant used in the refill was incompatible with the previous coolant, it is possible that the additive package “dropped” a load of silicates or precipitated a sludge that can cause heat transfer problems over a period of time … like your 3 months but not in 3 minutes or 3 hours.
A coolant analysis along with more detective work is in order. Given the extent of the work that (we are learning with each post) was performed we are probably missing a lot of troubleshooting information.[/QUOTE]
That’s all correct. Too little info. It would help to see the Cummings tech report.
Is there combustion gas in the cooling system? Is the engine shutting down on high JWT? If so, do the mechanical gages indicate high JWT? Is the JWT sensor calibrated? Is JW circulation visible? I have seen spun impellers. Many more questions if they’re electronic controled engines and don’t have an interface.