Help with Environmental Thermometer VW Bora 2.5L

How such, for a few months in the environmental thermometer of my bora I have noticed that the temperature that marks is always -3 ° C to -25 ° C being that the temperature here is 15 to 25 °, therefore when the temperature is below the 3rd the air compressor and the fan does not enter ... someone who told me where that environmental thermometer is located to be calibrate or replace it.

Jesus, give me the motor number and the year to see if I can help you, but usually the temperature sensor is on the headache (bumper) front on the left side to one side of the nebterine, sometimes that is why it hits and works badly, the other site is below the mechanism of the left clean pen

How Richyrey, thanks, as you told me I started looking for the bumper and removing the nebinero and removing the central lid of the bumper I could locate it, I did several tests and keep marking the same, I cleaned it and followed the same.
. The safest thing is to change it. thank you