HP Compaq Presario,Presario B1201 Maintenance And Service Manual page 84

Remove the fan (3) from the heat sink.
4.
Reverse this procedure to install the fan.
NOTE:
To properly ventilate the computer, allow at least a 7.6-cm (3-inch) 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.
76 Chapter 4 Removal and replacement procedures