If you can dismount the rad and rotate it in all directions while the pump is running, it should dislodge any air that might be causing a loss in flow.
There isn't much else you can do for a LCS cooler if it isn't working as there aren't any user-serviceable components. Thermal paste likely isn't your issue- even if you use too much, if you mount it correctly, it should squeeze the excess out to make good contact. It's technically possible to have too much, but this would also mean you have a very poor mount.
Alright, I will try that! Haha, I don't think that the mount ir bad cause it is the Corsair one that came with it. The cooler is on pretty solid. I tightened it really tight. If that doesn't work, I will see about returning it. How fast/slow should I turn the rad?
Thanks a lot for the help guys, it means a lot!