You can override the usual automatic temperature based activation by using the Auxiliary Heating menu in the AC part of the MMI. Could it be that it is constantly set to on? Do you have a little flashing heater icon on the main dash display by the time by the rev counter (I think?). Otherwise could be a faulty temperature sensor as it is set to come on under 5 degrees and as long as your low fuel light/warning is not on.
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Lee
2017 Nissan Leaf Tekna
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