CABIN
M6040, M7040, WSM
10-S1
1. TROUBLESHOOTING
COMPRESSOR
AIR CONDITIONING SYSTEM
Symptom Probable Cause Solution
Reference
Page
Noisy
(Compressor ON)
Bearing of compressor worn or damaged Replace 10-S42
Valves in compressor damaged Replace 10-S42
Belt slipping Adjust or replace 10-S42
Compressor bracket mounting screws loosen Tighten –
Piping resonant Tighten or add clamp –
Noisy
(Compressor OFF)
Blower defective Repair or replace 10-S27
Bearings of magnetic clutch, idle pulley or crank
pulley worn or damaged
Replace 10-S22
Symptom Probable Cause Solution
Reference
Page
Does Not Cool
(No Air Flow)
Fuse blown Replace 9-S11
A/C main relay defective Replace 9-S46
A/C blower motor defective Replace 10-S27
A/C blower switch defective Replace 10-S24
Wiring harness disconnected or improperly
connected
Repair –
Does Not Cool
(Compressor Does
Not Rotate)
Fuse blown Replace 9-S11
Magnetic clutch defective Repair or replace 10-S22
A/C switch defective Replace 10-S24
Pressure switch defective Replace 10-S30
Belt slipping Adjust or replace 10-S42
Does Not Cool
(Others)
Insufficient refrigerant Check with manifold
gauge
10-S21
Expansion valve defective Replace –
Compressor defective Replace 10-S42
Insufficient Cooling
(Insufficient Air Flow)
Air filter clogged Clean or replace G-30, G-31
Evaporator frosted Clean or replace
thermo switch
–
A/C blower motor defective Replace 10-S27
A/C blower resistor defective Replace 10-S27
Insufficient Cooling
(Many Bubbles in
Sight Glass)
Insufficient refrigerant Check with manifold
gauge
10-S21
Gas leaking from some place in refrigerating
cycle
Repair and charge
refrigerant
10-S13
Air mixed in Check with manifold
gauge
10-S15
Insufficient Cooling
(No Bubbles in Sight
Glass)
Too much refrigerant Check with manifold
gauge
10-S21
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