Brand new A/C system not working

Hi, and thanks for responding.

Like I said in my question originally, A/C system is brand new, compressor, aux fan, radiator and expansion valve. When the A/C finally kicks on (aux fan and compressor clutch) the system works perfect, ice cold A/C. There is some delay for that to happen and I cannot figure out. Yesterday I had Freon tested by a certified mechanic, he does not know the answer to my problem. I am thinking some kind of sensor, I think there is an aux fan sensor?
2005 BMW 325i
Thanks, Danny

Hi,
been awhile since we communicated.
I have done a whole lot of trial and error with this situation, changing, coolant sensor, ambient temperature sensor, aux fan relay, compressor relays and to no avail, until I had my friend put on ac computer and the code that came up was solar sensor, I did loads of research and couldn't find much information because apparently these do not go bad very often. I even had BMW try and diagnose, and they couldn't figure it out.
Finally I found the location in the front window down in the dash.
I hooked it pulled it out and exposed it and I started to get more response from system.
Changing this thing is to pull out complete dash and cluster which I can't afford so I am buying a new one and splicing to old wiring, should work.
But that was the whole problem,
thanks for your help figured you would be interested in final conclusion.

Danny