Komatsu PC88MR-10 Shop Manual page 1375

8. Other abnormalities
Probable cause
Temperature cannot be
controlled
Vent (mode) changeover is
not possible.
FRESH/RECIRC air cannot
be changed over
Excessive compressor oil
Water leakage into the cab
PC88MR-10
Check method
Select manual mode and change temperature setting.
See "Testing vent (mode) changeover".
See "Testing FRESH/RECIRC air changeover".
See "Handling of compressor oil".
Clogging of drain hole
80 Appendix
Troubleshooting chart 2
Remarks
Common to cooling
and heating
Cooling only
80-51