Nissan Xtrail air conditioning problems

I have a 2003 Nissan Xtrail Model, when placing the car button in car, it indicates the outer temperature -30 degrees centigrados, I have read the user manual and says that the air deficiting works when it marks temperatures greater than -7 degrees centigrados, my question is how I ask to restore the temperature, or do the outdoor temperature sensor or that of the sun or the sun. Glovers find the air lid and in that place a cabin air filter goes

The outdoor temperature sensor is bad

Thank you very much for answering, how can I verify if it is the sensor who is working badly or does not work, I can subtitle it by any standard or I must go to the CVASA to buy one_.
Thank you again

change sensor