heater core making weird noise?

[murderrsirenss]

so i just changed the tstat in my 240 and burp'd the system hoping my heat would work, and possibly my temp gauge. but now all my heater core does it make a weird noise. what do you think?

heres a crappy cell vid, but you can hear the noise.

Video - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting (http://tinypic.com/player.php?v=xm8hgy&s=5)

[alkemyst]

was your burping using the manifold bolt? if not you may still have air in the system.