Komatsu PC138USLC Operation & Maintenance Manual page 147

DETAILED CONTROLS AND GAUGES
Vent Selector Switch
Switch (4) is used to select the vents.
When switch (4) is pressed, the display on monitor display (7)
switches and air blows out from the vents displayed.
During automatic operation, the vents are automatically
selected.
(A): Rear vent (2 places)
(B1): Face vent (1 place)
(B2): Foot vent (1 place)
(C): Foot vent (1 place)
(D): Front window glass vent (2 places)
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OPERATION