Funny you should mention. Engine had an undisclosed overheating issue when I got it. It has a new head and gasket now. That still doesnt solve the problem of the buildup.

After each vinegar run, i flushed until clear. the first flush before all acid rinses was a strong detergent... I think it was "blahblahblah purple". the type you're not supposed to put on aluminum. ha....ohh


I have been reading a lot about CLR. It sounds possible, or a big waste of time. Mostly because I have NFC what this build up is made of.

I can bypass the heater core and I can scrap the radiator- I have a nicer one up at bat.



I appreciate your post. very helpful brainstorming, thank you.

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