892-0000010B OM
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7.12 Possible failures of air-conditioning and cab heating systems and guidelines
for troubleshooting
List of possible failures of air-conditioning and cab heating systems and guidelines
for troubleshooting are shown in Tables 7.12.
Table 7.12 – possible failures of air-conditioning and cab heating systems and guide-
lines for troubleshooting
Defect, external manifestation,
cause
Troubleshooting
Warm air is not supplied inside cabin
Fluid doesn’t circulate through heating
unit::
- heater valve is closed
- heater fan doesn’t function
- Clogged hoses
- presence of airlocks
Open heater valve
Correct the fan failure, check electric circuit
of fan engagement according to the dia-
gram of electrical equipment in
Annex A or B
Repair the fault
Remove air plugs
Too humid warm air is fed to cabin
Fluid leakage in heater radiator Eliminate leakage or replace radiator.
Fluid leakage in connections of heating
system
Tighten coupling clamps of heater
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