Thought I'd add some more helpfull info on this.
You can take your bleeder valve part out and goto your local hardware and find a small brass fitting like this.
Attach a small hose(I used fish tank air lines) to the end off the bleeder then stick the other end into the resevoir.
Start the engine and allow it to warm up. Should see bubbles coming thru the tubing, like this.
If no more bubbles are moving shut the engine off and allow it to cool down a little. Bubbles will start to move even after you shut it down.
You may need to repeat this a couple 3-4 times, but this works best.
If you just open the bleeder for a long period of time, and no bubbles are coming out, it can actualy suck more air back into the system. With this bleeder hose attached it can only suck coolant back into the system.