Coolant flush job?

[lonestarace]

Does anyoneknow the total system(engine/radiator) coolant capacity of a 42' 99 Executive w/tag and M11 450hp Cummins?
I called tech at Monaco and they weren't of much help.
Thanks in advance!
Don, Lisa,and Alexa

[Dutch Star Don]

I can't give you an exact number, but you'll probably be around 12-15 gallons. If you're going to do it yourself, buy the OAT (Organic Acid Technology) coolant that does not require test strips and lasts a loooong time. I bought Final Charge in a 50/50 mix and then a couple of extra gallons of straight Final Charge Coolant so I could get the final mix close to 50/50 because there will be water you'll never drain out. Usually a gallon or two.

[dashdriver]

I'll second Don's estimate. I did my 99 Navigator in Nov and it was around 15 gallons. I have the ISM 500 in mine, so it's the same engine.