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The most common problem with 1999 and up Jeeps over heating is the cooling fan relay. On your 2003 Jeep, if it has an A/C, check to see if the A/C clutch remains engaged when you turn it on. Both the cooling fan and the A/C clutch runs off the same relay circuit. The cooling fan relay is located below the passenger side head light assembly, you'll need to remove the fachia to access it.

Low coolant

Cooling fan not working

Defective thermostat

Plugged or restricted radiator

Bad radiator cap

System airbound

Hoses collapsing under pressure

Water pump not circulating coolant

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