Rev 4/2018
105
Symptom Problem Solution
Air conditioning system too
noisy
Loose or excessively worn drive
belt
Tighten or replace as necessary.
Noisy clutch Remove clutch for service or
replacement as necessary.
Compressor noisy Check mountings and repair;
remove compressor for service or
replacement.
Excessive charge in system Discharge excess refrigerant until
high-pressure gauge drops within
specifications.
Low charge in system Check system for leaks; charge
system.
Excessive moisture in system Replace receiver-dryer; evacuate
and charge system.
Air conditioning system cools
intermittently
Compressor clutch slipping Slippage over a prolonged period
will require that clutch be removed
for service; may require adjustment
for proper spacing.
Unit icing up may be caused by
excessive moisture in system,
inoperative expansion valve, or
faulty thermostat
Replace expansion valve; replace
receiver-dryer if excess moisture is
present; replace thermostat.
Thermostat defective Replace thermostat.
Defective blower switch or
blower motor
Remove defective part for service
or replacement.
Partially open, improper
ground, or loose connection in
compressor clutch coil or sole-
noid
Check connections or remove
clutch coil or solenoid for service
or replacement.
Compressor clutch cycles
excessively or compressor
stays off up to 15 minutes
Evaporator icing Adjust controls correctly. (See
Operator’s Station section.) Open
louvers. Clean filters. Move knob to
warmer setting.
Bad smell (foul odor) in cab
Plugged drain tube. Dirty filters.
Dirty cab
Blow out condensate tube. Clean
filters. Vacuum out cab.
Be certain weep valve in conden-
sate drain tube is installed.
AIR CONDITIONING
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