Dell Inspiron 518 (Mid 2008) - Manual (Page 20)

f. Hold the heat sink fan assembly in place and rotate the clamp lever 180 degrees clockwise to secure the heat sink and fan assembly.
6. Connect the processor fan and heat sink assembly cable to the CPU_FAN system board connector (see System Board Components ).
7. Replace the computer cover (see Replacing the Computer Cover ).
8. Connect your computer and devices to an electrical outlet, and turn them on.
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1 fan 2 fan cover 3 heat sink
4 bracket 5 clamp grip 6 bracket projection
7 clamp lever
NOTE: Ensure that the processor fan and heat sink assembly is correctly seated and secure.