This Laptop have 3 types Fan, listing item for Top View Left-side Fan GPU-L DP/N: CN-0R7H03 .
Click below link to Top View Right-side Cooling Fan DP/N: CN-0XHW5W:
http://cmyhub.com/proinfo/Dell-Alienware-M18x-R2-0XHW5W-XHW5W-DFS601305PQ0T-FA5V-DC280009GF0-GPU-R-Video-GPU-Cooling-Fan_6522.aspx
Click below link to Middle Cooling Fan DP/N: CN-0X2R7W :