17 R1, cooling fans question

Hi,  I'm hoping this forum can answer my question. There are 2 cooling fans on my friends Alienware 17 R1. I understand one if for the GPU and one for the CPU. The CPU fan basically runs constantly and is rather loud. The GPU fan does not run at the same time. Is this normal? My friend had taken the laptop into a computer repair shop for a "tune-up" and they basically fouled things up. I can't find an adjustment for the fan speed on this laptop. 

Should the GPU and CPU fans run at the same time?     

Thanks for any information you can provide.