Sounds like a potential airflow problem more than anything. Clean the condenser with a heavy duty degreaser, and clean in between the condenser and radiator, where leaves and bugs and crap build up. Make sure both fans (I believe you have two) are working properly.
2003 WJ in Jeep Green Metallic
, 4.0/242/4.10's. 4" Teraflex springs w/ RE monotube shocks and IRO short arms, cheap intake w/ amsoil filter, 2.5" hi flow cat and back exhaust, lots of lights and other misc crap.
Check out my build thread here: Life lessons and budget build