The first thing to try is cleaning between the AC condenser and radiator. An amazing amount of crud can get trapped in there. Unbolt the top of the radiator and tilt it toward the engine to get access in there and clean it out with a garden hose.

Do you have skid plates or are you stock? I never had cooling problems until I added a Calmini bumper and full skids. Now I can't run the AC idling for very long without the temp gauge climbing. With no AC it seems to do fine regardless of outside air temp.