Case 580SR Service Manual page 769

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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.
FAULT FINDING
Dust enters the cab
Blower motor air flow low
Blower motor not working
Cab does not heat up
Cab does not cool
Temperature not stable
SECTION 50 - CAB HEATING AND AIR CONDITIONING
PROBLEM
Improper seal around filter element
Blocked filter
Defective filter
Excessive air leak (s) around doors
and windows
Blocked filter or recirculation filter
Heater radiator core blocked
Fuse blown
Engine not reaching operating tem-
perature.
Thermostat stuck open
Heater hose from engine to cab radi-
ator, kinked or blocked
Heater control turned on
Heater control valve stuck in open
position
Low engine coolant
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.
CAUSE
Check the seal condition.
Clean or replace the filter.
Replace the filter.
Repair and Seal air leak(s).
Clean or replace the filter(s).
Clean radiator core thoroughly.
Replace fuse.
Replace the temperature switch.
Ensure water flow to heater radiator
is adequate and not restricted.
Turn the temperature control knob
fully counterclockwise for maximum
cooling.
Free up valve or change as required.
Top up coolant recovery tank.
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CORRECTION