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I'll read up on that, thanks. My house is on a well that has mineral laden water, so I sure won't be putting that into the cooling system. If I can't find pre-mixed at reasonable prices, I'll be sure to use distilled water free of minerals.

Whoops, I missed this post last night. Very interesting (and reassuring)! Yeah, no problems with removing the radiator. I have to replace all belts and hoses on the truck so I suspect that it'll just be easier with the radiator out of the way. I wanted to do this stuff this winter because I...

Thanks for the solid answers, guys. I've been driving clean, new cars for too long.

That was always the plan. I was just testing the coolant Ph to see if it was acidic while the truck was sitting and what kind of trouble the cylinder liners might be in.

Following advice given here, I performed a coolant test today, using test strips. The kit says it measures freeze point, nitrites and Ph. I opened the drain cock at the bottom of the radiator and a pure black fluid resembling engine oil drained out. After swearing a few choice words, I calmed...