TF radiator replacement advice?

Hey all :) My radiator is leaking and will have to be replaced, but not sure if I'll need to change the entire coolant fluid as well? Can it be done without changing the coolant fluid and just changing the radiator.



Also am worried about the possible air locks in the system? Should I be careful about that and make sure to let the air out, through the bolts, after the replacement?



Thanks for any answers guys :)

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