7cab air troubleshooting, Cab air troubleshooting, 7 cab air troubleshooting – MacDon M155 Operators Manual User Manual
Page 416
6.7
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 filter
Clean fresh air filter.
Cleaning Engine
Air Filter Primary
Element, page 301
Dirty recirculating air filter
Clean recirculating filter.
Cleaning Return
Air Cleaner, page
287
Evaporator clogged
Clean evaporator.
Cleaning Air
Conditioning
Evaporator Core,
page 289
Blower fan
operating but no
air coming into cab
Air flow passage blocked
Remove blockage.
—
Heater shut-off valve at engine
closed
Open valve.
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 filters
Clean filters.
Cleaning Engine
Air Filter Primary
Element, page
301
and
169883
400
Revision A