So the other day my 2003 g35 started running hot, come to find out my radiator had a crack on the top. I used jb weld first it lasted for a couple days for short distance. Today my radiator came. I installed it filled it but my car still overheats and doesn't blow out heat. What could be the problem?

 

You have air in the system. Gotta bleed the air out. Did you open the relief screw while adding coolant?