MacDon M105, Operator'S Manual

Page: 347 / 384

TROUBLESHOOTING
Symptom Problem Solution Section
Compressor clutch slipping.
Remove clutch assembly for service
or replacement.
Thermostat defective or
improperly adjusted.
Replace thermostat.
Contact Dealer.
Clogged air fi lters.
Remove air fi lters, and clean or
replace as necessary.
Cleaning Engine
Air Filter Primary
Element, page 235
and
Cleaning
Return Air Cleaner,
page 220
Heater circuit is open.
Close temperature control in cab,
and valve on engine).
3.10.3 Controls,
page 48
and
3.10.1 Heater
Shut-Off, page 47
Insuf fi cient air circulation over
condenser coil; fi ns clogged
with dirt or insects.
Clean condenser.
Air Conditioning
Condenser, page
221
Evaporator fi ns clogged.
Clean evaporator fi ns (under cab
fl oor).
Air Conditioning
Evaporator, page
222
Refrigerant low.
Clogged expansion valve.
Clogged receiver-drier.
Excessive moisture in system.
Air in system.
Air conditioning
not producing
suf
fi cient cooling.
(suf fi cient cooling
de fi ned as when
air temperature in
cab, measured at
louvered vent, can
be maintained
at 25°f (14°c)
below ambient
air temperature.)
Blower motor sluggish in
operation.
Contact Dealer. Contact Dealer.
Windows fog up. High humidity.
Run A/C to dehumidify air and
heater to control temperature.
3.10.3 Controls,
page 48
Unit icing up due to thermostat
adjusted too low.
Adjust thermostat. Contact Dealer.
Unit icing up due to excessive
moisture in system.
Unit icing up due to incorrect
super-heat adjustment in the
expansion valve.
Thermostat defective.
Defective blower switch or
blower motor.
Partially open, improper
ground or loose connection in
compressor clutch coil.
Air conditioning
cools intermittently.
Compressor clutch slipping.
Contact Dealer. Contact Dealer.
169890
333
Revision A