80-0000010B OM
370
7.14 Possible failures of the air ventilation and cab heating system and in-
structions for troubleshooting
List of possible failures of the air ventilation and cab heating system and instructions
for their troubleshooting are shown in Table 7.14.
Table 7.14 – Possible failures of the air ventilation and cab heating system and in-
structions for their troubleshooting
Failure, external manifestations,
cause
Troubleshooting
War, air is not supplied into the cab
Coolant is not circulated through
heating unit:
- heater control valve is shut off
- heater fan is does not work
- hoses are clogged
- air plugs presence
Open the heater control valve
Correct the fan failure, check electric circuit of fan
engagement according to the diagram of electrical
equipment in Annex A or B
Repair the fault
Remove air plugs
Heated air of increased moisture enters the cab
Coolant leakage in heater radiator Repair the leakage or replace the radiator
Coolant leakage in heater system
connections
Tighten the clamps
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