Summary reproduced from GD service manual:
Radiator and Fan Replacement 1. Drain the engine coolant.
2. Remove the front bumper, and front bumper beam.
3. Remove the condenser upper mount brackets.
4. Remove the upper bracket and cushions.
5. Remove the upper radiator hose, lower radiator hose and automatic transmission fluid (ATF) cooler hose.
6. Disconnect the fan motor connector, and remove the upper bracket and cushion, then pull up the radiator.
7. Remove the fan shroud assemblies and other parts from the radiator.
8. Install the radiator in the reverse order of removal. Make sure the upper and lower cushions are set securely.
9. Install the condenser upper mount brackets.
10. Install the front bumper beam, and apply body paint to the mounting bolts, then install the front bumper.
11. Fill the radiator with engine coolant and bleed the air.
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Step 3 above actually hyper links to a page about draining the aircon and removing the condenser. It is unlikely one has to remove the condenser.
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I googled this link on the same subject:
http://www.fitfreak.net/forums/1st-generation-gd-01-08/67485-07-fit-sport-radiator-problem.html