Question Help identifying laptop fan terminal

[Growtopia Jaw]

I have a Dell Latitude E6220 and the laptop fan has 4 pins. The wires aren't colored and are all black. I'm not sure which terminal is which and for some reason, there are 2 wires soldered to one terminal.

The model number of the fan is Forcecon DFS400805L10T

 

[Lutfij]

The first thing that comes to mind is, why are you trying to solder/desolder the wires on a fan? If the fan is causing an issue, replace with a genuine part numbered fan for the laptop and call it a day.