I note the same problem when leaving a cooler garage and driving outside into to near 100 degree temps. It takes the indicator at least five to ten miles of driving to register the correct temperature. When the outside temp is lower, the guage registers much more rapidly. I've got an '09 G-37 sedan that has the same issue. In reviewing other Nissan forums, this appears to be a common Nissan issue. Nissan apparently has logic built into the ECU that attempts to account for heat soaking of the sensor when the engine is hot. In addition, the vehicle has to be moving to register correctly.
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