SECTION 50 - CAB HEATING AND AIR CONDITIONING 9
FAULT FINDING -GENERAL
Items that may cause a concern are suggested in
the fault finding chart but as a general rule apply the
following steps:
Ensure water flow to the heater radiator is steady
and all air has been removed from the system.
Hoses are unrestricted and not leaking.
Check the electrical connections are good and the
blower motor is operational.
The operating cable to the heater valve and valve is
operational.
FAULT FINDING
PROBLEM CAUSE CORRECTION
Dust enters the cab Improper seal around filter element
Blocked filter
Defective filter
Excessive air leak (s) around doors
and windows
Check the seal condition.
Clean or replace the filter.
Replace the filter.
Repair and Seal air leak(s).
Blower motor air flow low Blocked filter or recirculation filter
Heater radiator core blocked
Clean or replace the filter(s).
Clean radiator core thoroughly.
Blower motor not working Fuse blown Replace fuse.
Cab does not heat up Engine not reaching operating tem-
perature.
Thermostat stuck open
Heater hose from engine to cab radi-
ator, kinked or blocked
Replace the temperature switch.
Ensure water flow to heater radiator
is adequate and not restricted.
Cab does not cool Heater control turned on
Heater control valve stuck in open
position
Turn the temperature control knob
fully counterclockwise for maximum
cooling.
Free up valve or change as required.
Temperature not stable Low engine coolant Top up coolant recovery tank.
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