[tcrist]

1) How hot did it get before you fixed the pin hole?

2) You probably still have a bunch of air in the system.
Jack the front up as high as you can get it (put it on jack stands). Then purge the system again. This time keep filling it up until it quits pushing the coolant out (do not fill the overflow at this time). Wait until it cools down and then fill the overflow only about 1/4 to 1/3 full. Drive it then and see how it does.

Watch the overflow after a couple of drives and be sure that it is not completely empty after it cools off. You want a little bit left in the overflow so you can see at a glance if it is using coolant.

At least that is how I do it.