1. TROUBLESHOOTING; Probable Cause; Reference - Page 744

CABIN

L3560, L4060, L4760, L5060, L5460, L6060, 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-S45

Valves in compressor damaged

Replace

10-S45

Belt slipping

Adjust or replace

G-29

Compressor bracket mounting screws loosen

Tighten

–

Piping resonant

Tighten or add clamp

–

Noisy
(Compressor OFF)

Blower damaged

Repair or replace

–

Bearings of magnetic clutch, idle pulley or crank 

pulley worn or damaged

Replace

10-S45

Symptom

Probable Cause

Solution

Reference 

Page

Does Not Cool
(No Air Flow)

Fuse blown

Replace

G-45

A/C compressor relay damaged

Replace

10-S29

A/C blower motor damaged

Replace

10-S27

A/C blower switch damaged

Replace

10-S23

Wiring harness disconnected or improperly 

connected

Repair

–

Does Not Cool
(Compressor Does 
Not Rotate)

Fuse blown

Replace

G-45

Magnetic clutch damaged

Repair or replace

10-S22

A/C switch damaged

Replace

10-S24

Pressure switch damaged

Replace

10-S30

Belt slipping

Adjust or replace

G-29

Does Not Cool
(Others)

Insufficient refrigerant

Check with manifold 

gauge

10-S13

Expansion valve damaged

Replace

–

Compressor damaged

Replace

10-S45

Insufficient Cooling
(Insufficient Air Flow)

Air filter clogged

Clean or replace

G-30

Evaporator frosted

Clean or replace 

thermo switch

–

A/C blower motor damaged

Replace

10-S27

A/C blower resistor damaged

Replace

10-S26

Insufficient Cooling
(Many Bubbles in 
Sight Glass)

Insufficient refrigerant

Check with manifold 

gauge

10-S13

Gas leaking from some place in refrigerating 

cycle

Repair and charge 

refrigerant

10-S19

Air mixed in

Check with manifold 

gauge

10-S13

Insufficient Cooling
(No Bubbles in Sight 
Glass)

Too much refrigerant

Check with manifold 

gauge

10-S13

KiSC issued 03, 2016 A