Cab Air Troubleshooting - MacDon M105 Operator's Manual

6.7 Cab Air Troubleshooting

Problem
Symptom
Burned out motor.
Burned out switch.
Motor shaft tight or
Blower fan will
bearings worn.
not run.
Faulty wiring—loose or broken.
Blower rotors in contact with
housing.
Dirty fresh air filter.
Dirty recirculating air filter.
Blower fan
operating but no air
coming into cab.
Evaporator clogged.
Air flow passage blocked.
Heater shut-off valve at engine
closed.
Defective thermostat in engine
water outlet manifold.
Heater not heating.
Heater temperature control
defective.
No thermostat in engine water
outlet manifold.
Plugged drainage hose.
Odor from air
louvers.
Dirty filters.
169890
TROUBLESHOOTING
Solution
Contact Dealer.
Clean fresh air filter.
Clean recirculating filter.
Clean evaporator.
Remove blockage.
Open valve.
Replace thermostat.
Replace control.
Install thermostat.
Blow out hose with compressed air.
Clean filters.
331
Section
Contact Dealer.
Cleaning Engine
Air Filter Primary
Element, page 235
Cleaning Return
Air Cleaner, page
220
Cleaning Air
Conditioning
Evaporator Core,
page 223
—
3.10.1 Heater
Shut-Off, page
47
Contact Dealer.
—
Cleaning Engine
Air Filter Primary
Element, page 235
and
Cleaning Return
Air Cleaner, page
220
Revision A