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In the 2015 Nissan Altima, the ambient temperature sensor is situated behind the front grill and in front of the radiator. It detects the external temperature and regulates the AC cooling inside the vehicle based on the outside temperature. So, on a hot day, when it's scorching outside, the sensor informs the ECU that even after the cabin reaches the desired temperature, the AC should continue running to counter the extra heat outside. This ensures maximum efficiency in cooling to maintain a comfortable temperature despite the high external temperature. A malfunction in this sensor could lead to discomfort in the car's interior. The typical cost to replace this sensor ranges from $80 to $110.
The ambient temperature sensor for the 2015 Nissan Altima is positioned behind the grille, right before the radiator.