If I remember correctly the air will purge itself. I think there is an additional cavity at the thermostat that will start capturing the air and evacuate it automatically. Will just take some time.

__________________
~shell
As of 2/2010:
2001 CLK55 0o\=*=/o0
13.6 @ 106mph
10K mi
1984 300SD
260K mi and going and going...
97 S600
46K miles
1991 Sentra SE-R (extremely dorked with)
www.se-r.net