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I don't know if there is a plug on the back of the 4.0 block.
When you "burped" the system, did you get it back to pressure again before looking for the leak? Does the cap hold its rated pressure? A bad cap is a cheap fix for an overheat sometimes.
If you have access to a pirometer (temperature probe), check the radiator temp at different places. Check for a major temp diference parallel to the tanks. This would indicate a plugged up radiator.
Also, a lean mixture and/or over-advanced timing would cause it to run hot as well.
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Steve
'98 JGC (ZJ) 5.2L, Aluminum Radiator w/Electric Fans, 4" Cowl Induction Hood Scoop, Custom High Flow Air Filter, Magnaflow Cat / Flowmaster Super 40 Exhaust, Engine Oil cooler w/ remote filter, In-roof 8" DVD, Profile 600 Watt Amp, Kenwood 6.75" 3-ways, NV242, 3.5" Lift, RS9000s, 31x10.50x15 ATs, Proline roof rack w/ spare tire mount and 4 Hella 550s.
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