make sure you flush the cooling system while the thermostat is out, is the koyo rad supplied with new radiator caps ?, if they are then make sure you check what pressure rating they are and make sure they are rated the same as your original ones

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Marti


Car: C Red S13 Silvia 2.3l 400+rwhp-SOLD
Daily ae82 4age corolla (light mods)-Sold
Daily:SWB GQ Patrol
Will be a 03-04 STI next