TROUBLESHOOTING
Symptom
Problem
Solution Section
Compressor cl
utch slipping
Remove clutch
assembly for service
or replacemen
t.
Thermostat defective or
improperly adjusted
Replace thermostat.
Contact Dealer
Clogged air filters
Remove air filters, and clean or
replace as necessary.
Cleaning Engine
Air Filter Primary
Element, page
343 and Cleaning
Return Air Cleaner,
page 328
Heater circuit is open
Close tem
perature control in cab,
and valve
on engine).
3.10.3 Cl
imate
Controls
,page57
and 3.10.
1Heater
Shut-Off
, page 56
Insufficient air circulation over
condenser coil; fins clogged
with dirt or in se ct s
Clean condenser.
Air Conditioning
Condenser, page
329
Evaporator fins clogged
Clean evaporato r fins (under cab
floor).
Cleaning Air
Conditioning (A/C)
Evaporator Core,
page 329
Refri
gerant low
Clogged expansion valve
Clogged receiver-drier
Excessive moisture in system
Air
in system
Air conditioning
not producing
sufficient cooling.
(sufficient coolin g
defined as when
air temperature
in cab, m easured
at louvered vent,
can be maintained
at 25°F [14°C]
below ambient air
temperat ure.)
Blower motor sluggish in
operation
Contact Dealer. Contact Dealer
Unit ic ing up due to thermostat
adjusted too low
Adjust thermostat.
Un
it icing up due to excessive
mo
isture in syste m
Unit icing up du e to incorrect
super-heat adjustment in the
expansion valve
T
hermostat defective
Defective blo we r switch or
blower motor
Partially open, improper
ground or loose connection in
compressor clutch coil
Air Conditioning
Cools
Intermit tently
Compressor clutch slipping
Contact Dealer.
Contact Dealer
147649
4
44
Revision A
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