Komatsu PC138US-11 Operation & Maintenance Manual page 280

HANDLE AIR CONDITIONER
4.
Press temperature control switch (3) and set temperature
to 32.0 of maximum heating.
5.
Adjust vents (A), (B1), and (B2) so that the air blows onto
the window glass.
(Vents (C) and (D) are fixed and cannot be adjusted.)
6.
When operating in the rainy season or when it is desired to
remove the mist from the window glass or to dehumidify
the air, press air conditioner switch (8) to turn it ON.
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