Source: NissanHelp

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1. Remove undercover.

2. Drain coolant from radiator.

Open radiator drain plug at the bottom of radiator and remove the radiator filler cap.

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3. Remove Drive Belts

Refer To :Drive Belts Removal Procedure

4. Remove water drain plug on water pump side of the engine.

5. Remove right-hand side engine cover.

6. Remove coolant reservoir.

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7. Disconnect lower radiator hose.

8. Disconnect oil cooler line.

9. Remove engine coolant inlet and thermostat assembly.

Note: Do not disassemble engine coolant inlet and thermostat

10. Install in reverse order.