if you ud alot and are running hot on the highway often you get mud between the Air-cond condensor and radiator.. only way to clean that out is to remove the rad and clean out both the A/C find and the rad fins.... that happened to me constantly on my TJ's.. made me wish I could remove the condensor but i sure as heck wasnt going to be without A/C so I just figured on removing the rad after a big time mud run...
-Christopher