Replacing Radiator, should I replace it THEN do an engine radiator flush

Slantsix64 said

I cleaned out rusted cooling systems with casacade containing phosphorus it can still be found in mom and pop shops, just mix it with water run your car for a couple of days with out your thermostat flush it and repeat also undo the top hose and blast water from a how thru the engine while running repeat until its decent. Also wal mart sells evaporust for 20.00 dollar that stuff works very good and is made for heavy rusted systems, Preston never got the job done like the cascade or evaporust.

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Yeah Evaporust seems like the most harmless non corrosive one. I started today by taking out the Thermostat ...draining the radi and filled with distilled water 2 gallons...then ran for 10 min with heat on full blast and rev the engine. ...dumped and then repeat... still green, but I left it....looks like my friends in Bronx may have a hose for me...I can go wash out the engine and then install the radiator Sunday *crossing fingers* ...now whats interesting is at 10 min of idea idle with heat on...the temp gaugdidn'tnt go near where it would normally. Dont know what to think of that. I have an infared gun, that will give reliable heat, but im not sure exactly where to point it to get the most reliable reading. Anyone thoughts?