IS 350 V6-3.5L (2GR-FSE) (2006)
B.
Remove the 4 bolts, nut, and water outlet sub-assembly.
C.
Remove the water inlet housing gasket and water outlet pipe 0-ring.
D.
Remove the water inlet sub-assembly with thermostat. Remove the 3 nuts, water inlet with thermostat, and gasket.
9.
If leakage is confirmed in step 4, remove and replace the radiator assembly. Refer to TIS, 2006 model year IS 350 Repair Manual:
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Engine/Hybrid System - Cooling - "2GR-FSE Cooling: Radiator: Installation"
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Engine/Hybrid System - Cooling - "2GR-FSE Cooling: Radiator: Removal"
Repair Procedure:
Installation