NOTE: To properly ventilate the computer, allow at least a 7.6-cm (3-in) clearance on the left side of
the computer.
The computer uses an electric fan for ventilation. The fan is controlled by a temperature sensor and is
designed to turn on automatically when high temperature conditions exist. These conditions are
affected by high external temperatures, system power consumption, power management/battery
conservation configurations, battery fast charging, and software requirements. Exhaust air is
displaced through the ventilation grill located on the left side of the computer.
Heat sink
All heat sink spare part kits include replacement thermal material, including thermal grease and pads.
Description Spare part number
Heat sink 658140-001
Before removing the heat sink, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn
the computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet,
and then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 41).
5. Remove the bottom door (see
Bottom door on page 47).
6. Remove the fan (see
Fan on page 65).
Remove the heat sink:
1. Position the computer upside-down with the front toward you.
2. In the order indicated, loosen the captive Phillips screws (1) that secure the heat sink to the
system board.
3. Lift the heat sink up at an angle (2).
66 Chapter 4 Removal and replacement procedures
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