214733 413 Revision A
7.7 Cab Air Troubleshooting
Problem Solution
Section
Symptom: The blower fan will not run.
Burned out motor
Contact Dealer.
—
Burned out switch Contact Dealer.
—
Motor shaft tight or bearings worn
Contact Dealer.
—
Faulty wiring—loose or broken Contact Dealer.
—
Blower rotors in contact with housing Contact Dealer.
—
Burned out motor
——
Symptom: The blower fan is operating, but air doesn’t blow into the cab.
Dirty fresh air filter Clean fresh air filter.
Inspecting and Cleaning Fresh Air
Intake Filter Element, page 299
Dirty recirculating air filter Clean return air filter.
5.9.1 Servicing Return Air Filter, page
304
Evaporator clogged Clean evaporator.
Cleaning Air Conditioning (A/C)
Evaporator Core, page 355
Air flow passage blocked Remove blockage.
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Symptom: Heater is not heating.
Heater shut-off valve at engine closed Open valve. 3.10.1 Heater Shut-Off Valve, page 59
Defective thermostat in engine water
outlet manifold
Replace thermostat. Contact Dealer.
Heater temperature control defective Replace control. Contact Dealer.
No thermostat in engine water outlet
manifold
Install thermostat. Contact Dealer.
Symptom: Air louvers emitting odor.
Plugged drainage hose Blow out hose with compressed air.
—
Dirty filters Clean filters. Contact Dealer.
Symptom: Air conditioning is not cooling.
Low refrigerant level Add refrigerant.
Contact Dealer.
Clutch coil burned out or disconnected Contact Dealer.
—
Blower motor disconnected or
burned out
Contact Dealer.
—
Switch contacts in thermostat burned
excessively, or sensing element
defective
Replace thermostat. Contact Dealer.
Compressor partially or
completely seized
Remove compressor for service or
replacement.
Contact Dealer.
Condenser fins plugged Clean condenser.
Cleaning Left Cooling Module, page
306
TROUBLESHOOTING
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