MacDon M105 - Cab Air Troubleshooting

TROUBLESHOOTING
6.7 Cab Air Troubleshooting
Symptom
Problem
Solution Section
Burned out mot
or.
Burned out switch.
Motor shaft
tight or
bearings wo
rn.
Faulty wiring—loose or broken.
Blower fan w
ill
not run.
Blower rotors in contact with
housing.
Contact Dea
ler.
Contact Dea
ler.
Dirty fresh air filter. Clean fresh air filter.
Cleaning Engine
Air Filter Primary
Element, page 235
Dirty re
circulating a ir filter.
Clean re
circulating filter.
Cleanin
g Return
Air Clea
ner, page
220
Evaporator clogged.
Clean evaporator.
Cleaning Air
Conditioning
Evaporator Core,
page 223
Blower fan
operating but no air
coming into cab.
Air flow passage blocked.
Remove blockage.
—
Heater shut-off valve at engine
closed.
Open valve.
3.10.1 Heater
Shut-Off, page
47
Defectivethermostatinengine
water outlet manifold.
Replace thermostat.
Heater temperature control
defective.
Replace control.
Heater not heating.
No t
hermostat in engine water
out
let ma nifold.
Ins
tall th ermostat.
Contact Dealer.
Plugged drainage hose. Blow out hose with compressed air.
—
Odor from air
louvers.
D
irty filters.
C
lean filters.
Cl
eaning Engine
A
ir Filter Primary
E
lement, page 235
a
nd
C
leaning Return
A
ir Cleaner, page
2
20
169890 331 Revision A