Cooling Fans!

I was just told by a auto shop that one of my cooling fans are out. When I got home I turned on my AC and the one fan that he said was out turns on. So is it out or does it come on intermittenly when needed. How do these two fans work that are normal so I dont get ripped off?
I have a 94 3000gt vr4 and any advice would help.
Thanks Vicky

Under normal cicrumstances only the large fan comes on to cool the radiator. The second smaller fan only comes on when the AC is turned on, or the car starts to overheat.

Just as I thought. I appreciate your info on this. I am learning alot about my car just asking questions. I can now rest easy! I love my car!*_*
Thanks!

Any questions you ever have feel free to post up. We will do what we can to help answer them.