Komatsu PC138USLC Operation & Maintenance Manual page 155

DETAILED CONTROLS AND GAUGES
Defroster Operation
1. Press fan switch (2) and adjust the air flow. When doing this,
check that temperature setting (a) and air flow (b) are displayed
on monitor (7).
2. Press vent selector switch (4) and set vent display on the
display monitor to (f) or (g) as shown in diagram on the right.
3 - 100
OPERATION