the easy way to get a motor to "burp" is park it on a incline.... with the radiator being at the highest point possible. Let it set for a bit, most of the remaining air will bubble up to the radiator cap. I've also had luck parking it level and opening the temp sensor slightly at the t-stat houseing for those small little bubbles...
2003 TJ 4.0 5-speed 31inch Goodyear Authority's, 2inch Rubicon Express Springs, Hella Vision Plus H/L's, IPF upgraded H/L wiring harness. JCR Offroad Stage 2 Frt Bumper with CocaCola Bottle opener, Smittybuilt XCR8 Winch, Rampage Bowless top.