ok , here's a little how to replace your radiator in your R33 GTS-T.
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1. Open bonnet, undo the coolant recovery hose clip and move hose out of the way.
2. Undo the temperature sensor wiring at plug on the side of radiator, then loosen the 4 hose clamps on the top and bottom radiator hoses. (see pic ). Remove the 2 hoses.
3. Remove the 2 self taping screws that hold the fan shroud to the radiator and wiggle in around abit to remove in from it's retaining clips at the base of radiator. Undo the 2 nuts that hold the support brackets of the support mounts. (see pic )
4. Push the fan shroud back towards the engine as far as you can, then turn support brackets out of the way and remove radiator by gently lifting upwards, ensuring not to damage the delicate cooling fins and tubes. ( see pic )
5. Now this is were the choice is up to you, depending on circumstance or fault... From here I removed the thermostat housing and tested the old one, found it faulty ( not opening properly ). My recommendation is that if there is any doubt with the thermostat, replace it, as if it doesn't open when it's supposed to it will inevitably cook your engine or make it operate at temperatures it not supposed to.
6. To replace thermostat housing, remove old sealant from housing using a suitable scraper and I used a wet/dry sand paper to finish of the surface .
7. Do the same for the mating surface of the engine block.
8. From here place the thermostat into it housing, apply a suitable sealant to both mating surfaces and refit the thermostat housing to engine block.
9. When refitting the radiator ensure the 2 rubber mounts are in place on the locaters on the bottom of radiator and refit is reverse of removal.
10. Once all hoses and mounts are fitted and tightened correctly, fill with suitable coolant and test for leaks.
NOTE - this is only a simple explanation and if in doubt don't do it.
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by Nuffin_werks