Nissan 21200-JK20A Thermostat Assembly

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To replace the thermostat, follow these steps: Disconnect the cable from the negative battery terminal. Raise the vehicle and support it securely on jackstands. Remove the engine lower splash shield. Drain the cooling system completely. Remove the engine cover, air filter housing, and intake duct. Remove the coolant reservoir and any obstructing water pipes leading to the oil cooler. Remove the left (driver's) side intake valve timing control cover mounted to the timing chain cover and in front of the thermostat housing. Loosen the hose clamp by squeezing its tabs and sliding it up the hose. Detach the hose(s) from the thermostat housing. Remove the thermostat housing cover fasteners and the housing itself. Discard the old gasket and clean all mating surfaces. Install a new gasket. Reassemble in reverse order, ensuring proper torque for thermostat housing cover bolts. Refill the cooling system. Start the engine, allow it to reach normal operating temperature, and check for leaks and proper operation.