you wont see any carbon in the water you have to take it somewhere they can anyalize it. it will be a trace amount if it's even there. Feb 2002 custom classic trucks has "12 cooling tricks" there site is wwwcustomclassictrucks.com roughly -any frankly, they aren't much good: 1:aluminum radiator cause of wider fins than copper 2:higher fin count, towards 14 not 8 per inch 3:gentle bends, as sharp angles/edges even 45 degrees can slow up water 4: make sure you got lots of juice to the elec. fan-don't underdrive alternator 5:formed hoses vs. ribbed ones 6: seal the rad. to the fan 7:bulletproof hoses 8: lame9:compare airflow to amp draw, they recommended a SPAL axial motor fan at 2360 cfm. 10:gay 11 use right pressure cap(probably @ 7 lbs), 12: dont get cheap flex fan w.flimsy blade as they flatten out over time, get stainless steel blade one with hnicely set rivets with adequate spacing btwn rivet holes and between the edges of the central hub-no comment on plastic fans for long term use but said they were fine at drags. well hope you solve your problem.
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