Dell Inspiron 537s (Mid 2009) - Manual (Page 26)

4. Connect the processor fan and heat sink assembly cable to the fan connector on the system board (see System Board Components ).
5. Replace the computer cover (see Replacing the Computer Cover ).
6. Connect your computer and devices to an electrical outlet, and turn them on.
Removing the Chassis Fan
1. Follow the procedures in Before You Begin .
2. Remove the computer cover (see Removing the Computer Cover ).
3. Disconnect the chassis fan cable from the chassis fan connector on the system board (see System Board Components ).
4. Remove the screw securing the chassis fan.
5. Slide the chassis fan towards the front of the computer and lift it up.
1 processor fan and heat sink assembly 2 clamp lever 3 bracket projection
4 clamp grip 5 bracket
CAUTION: Do not touch the fan blades when you are removing the chassis fan. This could damage the fan.