TROUBLESHOOTING
6.7 Cab Air Troubleshooting
Symptom
Problem
Solution Section
Burned out mot
or
Burned out switch
Motor shaft
tight or bearings
worn
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 343
Dirty r e
circulating air filter
Clean re
circulating filter.
Cleanin
g Return
Air Clea
ner, page
328
Evaporator clogged
Clean evaporator.
Cleaning Air
Conditioning (A/C)
Evaporator Core,
page 329
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
56
Defective thermostat in engine
water outlet manifold
Replace thermostat.
Heater temperature control
defective
Replace control.
Heater not heating
No t
hermostat in engine water
out
let manifold
Ins
tall thermostat.
Contact Dealer
Plugged drainage hose Blow out hose w ith c ompressed air.
—
Odor from air
louvers
D
irty filters
C
lean filters.
Cl
eaning Engine
A
ir Filter Primary
E
lement, page
3
43
a
nd Cleaning
R
eturn Air Cleaner,
p
age 328
147649
4
42
Revision A
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