in need of a/c wiring diagram w900

Is there still a refrigerant charge in the A/C system? Also a lot of newer vehicles lockout the A/C below a set ambient temperature and only allow the compressor to cycle occaisionally for defrost.

 

Find the a/c relay, then key on eng off put your finger on the relay and with other hand push the a/c dash switch, if the relay clicks this shows the ground side switching works, now check to see if the a/c compressor clutch locks up, if not wiggle some wiring, it may start engaging if you find a poor connection.
I will see if I can upload a wiring diagram

 

hope this works