HP Compaq Presario,Presario C300 Maintenance And Service Manual page 24

Product Description
Item Component
5 Vents (2)
1–18
Bottom Components (Continued)
Table 1-8
Function
Enable airflow to cool
internal components.
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To prevent overheating, do not
obstruct vents. Use the computer
only on a hard, flat surface. Do
not allow another hard surface,
such as an adjoining optional
printer, or a soft surface, such as
pillows or thick rugs or clothing, to
block airflow.
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The computer fan starts up
automatically to cool internal
components and prevent
overheating. It is normal for the
internal fan to cycle on and off
during routine operation.
Maintenance and Service Guide