Dell OptiPlex 7020 (Mid 2014) - Manual (Page 28)

3. Using both hands, push away the two release handles while lifting the fan shroud upward and off the
computer.
4. Disconnect the fan cable from the system board. Loosen the captive screws, lift the heat sink
assembly and then remove it from the computer.
Installing the Heat Sink Assembly
1. Place the heat-sink assembly into the chassis.
2. Tighten the captive screws to secure the heat-sink assembly to the system board.
3. Connect the fan cable to the system board.
4. Place the fan shroud on the fan and push to click in place.
5. Install the cover
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