Quote Originally Posted by MelloYello View Post
Don't know if that radiator will stand too much retained pressure but I'll sure consider all of this information when the time comes.

thanks Jerry, have a good'un,
Em
Em,
The key is that you're removing air from the system, and if you keep the same pressure range on the cap you'll still help yourself. Running an air cushion on top doesn't change the system pressure - it's just a matter of whether it's pressurizing a big air bubble or a full charge of coolant which gives you more volume for heat transfer and less corrosion.