Dell Vostro 270 (Late 2012) - Manual (Page 22)

5. Lift the heat sink and fan assembly, and remove it from the computer.
NOTE: Place the assembly with the fan on a flat surface, facing downward and with the thermal grease facing
up.
6. Press down on the release lever to move it outward to release it from the retention hook.
7. Lift the processor cover.
22