3. Check Thermostat Operation
WARNING: This page is about a different car, the 2004 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.
When the engine is under cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm the engine coolant does not flow.
OK or NG
OK: GO TO 4.
NG: Repair or replace thermostat. Refer to THERMOSTAT AND WATER CONTROL VALVE .