7.7 Cab Air Troubleshooting
Symptom
Problem
Solution
Section
Burned out motor
Burned out switch
Motor shaft tight or bearings
worn
Faulty wiring—loose or broken
Blower fan will
not run
Blower rotors in contact with
housing
Contact Dealer.
Contact Dealer
Dirty fresh air
fi
lter
Clean fresh air
fi
lter.
Inspecting And
Cleaning Fresh
Air Intake Filter
Element, page 267
Dirty recirculating air
fi
lter
Clean return air
fi
lter.
5.8.1 Servicing
Return Air Filter,
page 271
Evaporator clogged
Clean evaporator.
Cleaning Air
Conditioning (A/C)
Evaporator Core,
page 314
Blower fan
operating but no
air coming into cab
Air
fl
ow passage blocked
Remove blockage.
—
Heater shut-off valve at engine
closed
Open valve.
3.10.1 Heater
Shut-Off Valve,
page 60
Defective thermostat in engine
water outlet manifold
Replace thermostat.
Heater temperature control
defective
Replace control.
Heater not heating
No thermostat in engine water
outlet manifold
Install thermostat.
Contact Dealer
Plugged drainage hose
Blow out hose with compressed air.
—
Odor from air
louvers
Dirty
fi
lters
Clean
fi
lters.
5.8.1 Servicing
Return Air Filter,
page 271
214053
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Revision A
Summary of Contents for M1240
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