MacDon M105 - Page 347

TROUBLESHOOTING
Symptom
Problem
Solution Section
Compressor cl
utch slipping.
Remove clutch
assembly for service
or replaceme n
t.
Thermostat defective or
improperly adjusted.
Replace thermostat.
Contact Dealer.
Clogged air filters.
Remove air fi lters, and clean or
replace as necessary.
Cleaning Engine
Air Filter Primary
Element, page 235
and Cleaning
Return Air C leaner,
page 220
Heater circuit is open.
Close tem
perature control in cab,
and valve
on engine).
3.10.3 Co
ntrols,
page 48
and 3.10.
1 Heater
Shut-Off
, page 47
Insufficient air circulation over
condenser coil; fi ns clogged
with dirt or insects.
Clean condenser.
Air Conditioning
Condenser, page
221
Evaporator fins clogged.
Clean evaporator fins (under cab
floor).
Air Conditioning
Evaporator, page
222
Refri
gerant low.
Clogged expansion valve.
Clogged receiver-drier.
Excessive m ois ture in system.
Air
in system.
Air conditioning
not producing
sufficient cooling.
(sufficient cooling
defined as when
air temperature in
cab, measured at
louvered vent, can
be maintain ed
at 25°f (14°c)
below ambient
air temperature.)
Blower motor sluggish in
operation.
Contact Dealer. Contact Dealer.
Wi
ndows fog up. High humidity.
Ru
n A/C to dehumidify air and
he
ater to control temperature.
3.
10.3 Controls,
pa
ge 48
Unit icing up du e to thermostat
adjusted too low.
Adjust thermo stat.
Contact Dealer.
Unit icing up due to excessive
moisture in sy stem.
U
nit icing up due to incorrect
s
uper-heat adjustment in the
e
xpansion valve.
Thermostat defective.
Defective b lower switch or
blower motor.
Partially open, improper
ground or loose connection in
compressor clutch coil.
Air conditioning
cools intermittently.
Compresso r clutc h slipping .
Contact Dealer. Contact Dealer.
169890 333 Revision A