2015 Forester 2.5i Premium 6-speed manual
Did you check the radiator thermofan switch(es)? on the radiator?
I stand corrected, Kevin. Except for my very first car when I was in the Navy, and then only for a few months before I bought a VW (it was a 1964 6-cyl 2 dr. Chevy Bel Air), VWs and Audis are all I have owned since 1976. My first water-cooled VW was in 1981 and I was also working in a shop at the time that focused only on German Cars and then mostly VW and Audi automobiles. I have seen a lot of thermofan switches in my day.The sensors referred to by karlaudi did not exist on either of my Subarus therefore I doubt very much they would be on your vehicle. The workshop manual for MY'03 (incls non-turbo and turbo) refers to just one "Engine Coolant Sensor". As well there is the "Intake Air Temp Sensor" and the "ATF Temp Sensor" but I cannot imagine either of these stopping the fans.
If the car needs to be used just run direct fused power to the fans with a switch under the hood. I did this as a temporary fix in the past.