Clean radiator, cool engine, coolant PH, flow, fans, shrouds.

Great thread Rice Nuker, I just got done reading through it in it's entirety. Muriatic acid is wonderful stuff, and I can't even begin to tell you how many motorcycle gas tanks I've saved using it, plus it makes expensive "Rust Dissolve" products look like a joke. It is potent though and will cause serious burns and you don't want to inhale the fumes. Rubber gloves and safety glasses are not an option, but mandatory. I know you know this, but I just thought I'd re-iterate the safety concerns. :)

One point about cooling systems I'd like to discuss is altitude and it's effect on cooling. I believe that altitude is a cooling system double whammy. Not only is the boiling point of water lowered, but believe (can't prove it) that since the density of air is so much less, that there is less air running through a radiator at any given time to dissipate (transfer) heat, whether at speed or at idle regardless of the type of fan used. In regards to boiling points at differing altitudes, check out the chart below:

0' ~ 212 F
1000' ~ 210.2 F
2000' ~ 208.4 F
5000' ~ 203 F This just a bit lower than Denver
6000' ~ 201.1 F This is just a bit lower than Bandimere Dragway
8000' ~ 197.4 F
10,000' ~ 193.6 F This is about where I was when I was Jeeping last week
12,000' ~ 189.8 F About the highest pass in Colorado
14,000' ~ 185.9 F Lower than the highest peak in Colorado