My Dell Inspiron E1705's processor fan was making sad, dying, and most importantly loud sounds. I ordered the part numbers from Ebay and followed this guide. It worked!
A few notes : I ordered the part numbers from Ebay, and originally was going to replace both the GPU and CPU fan. I decided to only replace the Processor fan because while the part number for the GPU fan and the shape/look of the GPU fan was identical, the GPU fan from Ebay was manufactured by Toshiba.
When opening the case, something was attached the the upper right hand corner (maybe the wifi?) I managed to maneuver around and get to the fans without taking the case all the way out.
The new fan works very well. I couldn't have done it without the guide, very helpful! It took me about 15 minutes start to finish.