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It sounds like thermostat opening too late or not enough. TB45 should have an 82 degree thermostat.
It's not difficult to test a thermostat. Even new could have a defect. Was it a genuine Nissan?
Mine rarely gets above 85 on the Ecutalk but when I first installed it, it was showing very low temps - rarely getting above 75 - so I changed the ECU temp sensor and then it showed normal temps.
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