Dell Vostro 220 (Late 2008) - Manual (Page 101)

Processor Heat Sink/Fan Assembly
101
Replacing the Processor Heat Sink/Fan Assembly
NOTICE:
Unless a new heat sink is required for the new processor, reuse the
original heat sink/fan assembly when you replace the processor.
1 Apply thermal solution to the heat sink as needed.
2 Align the four captive screws on the heat sink/fan assembly with the holes
and rubber bushings on the system board.
4
1
2
3
5
6