[Richard and Rhonda]

Tom,

Do you have a leak, or just trying to get the most cooling capacity?

If it's just cooling efficiency, I would do this trick before I pulled the radiator. I would drain and SAVE the coolant. Run the standard radiator flush to chemically remove any scale on the inside tubes, refill with the old coolant (after checking SCA's and pH) and run a trial to see if it runs any cooler on a known grade.

I mentioned save the coolant, because if you don't like the results, and end up pulling the radiator any way, you won't have wasted 15 or so gallons of new coolant.