Sorry about the delay responding- - - - -major computer troubles with both the laptop I use, and the desktop unit my wife prefers. They're both at the computer doc- - - -who is putting a vacuum cleaner to my checking account for two new systems and trying to transfer several years' worth of files! I finally managed to change the password on a system my BIL used before he passed away several months ago so I have some limited internet access for the time being.

I use about a pound of TSP to 5 gallons of water in a stainless steel tank when I'm degreasing guns prior to rust-bluing them. That same ratio should work well in a cooling system. I run the degreaser tank just below the boiling point- - - -180-200 degrees F.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!