outside air temp gauge
 

Mother inlaw has 99 s70. problem is her outside temp gauge is not accurate with the car for example it may be 60 outside car says 80 outside? Also having A/C issues one day it will very cold next warm. It changes from day to day.

Could be bad temp sensor.

the ones located up front under the car? Is there 2?

Yea under the car in front and there should be just one looks like this.
http://www.ipdusa.com/uploads/images_skus/12885.jpg