Don't forget about the fresh water side. When I rebuilt the W60 the block was dipped prior to honing. When I got it back I flushed it and the head out with a hose. What came out was residue from old antifreeze called 'drop out', a lot of it. This scale will prevent the AF from capturing heat effectively. The raw water side can be clean as a whistle but if you are not getting the heat over there its pointless.
There are fresh water products for descaling, I've never used any. Class 8 trucks have filters on the cooling systems to capture such sediment. The important thing is to change the AF each year or so. It's cheap insurance.

Chuck

……… Hoping to run COOL this summer.

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