wsm STW37 Workshop Manual page 502

STW34, STW37, STW40, WSM
Symptom
Insufficient Cooling
(Compressor
Magnetic Clutch
Does Not Work)
Insufficient Cooling
(Hi-pressure Level is
Too High)
Insufficient Cooling
(Hi-pressure Level is
Too Low)
Insufficient Cooling
(Low-pressure Level
is Too High)
Insufficient Cooling
(Low-pressure Level
is Too Low)
Insufficient Cooling
(Both Hi-pressure
and Low-pressure
Level is Too High)
Insufficient Cooling
(Both Hi-pressure
and Low-pressure
Level is Too Low)
Temperature Cannot
be Controlled
(Temperature Motor
and / or Temperature
Control Dial
Malfunction)
Temperature Cannot
be Controlled
(Water Valve Does
Not Open Properly)
Probable Cause and
Checking Procedure
1. Low battery voltage
2. Rotor in contact with stator Replace rotor.
3. Wrong wiring loose
connections
4. Relay is damaged.
5. Coil shortage
6. Ground malfunction
1. Refrigerant overcharged
2. Condenser is clogged with
dust and dirt
3. Air mixed
1. Refrigerant too short
2. Compressor discharge
valve is damaged
3. Compressor gasket is
damaged
4. Low-pressure pipe in
trouble.
(Cracked or clogged)
1. Refrigerant overcharged
2. Expansion valve too open
1. Refrigerant too short
2. Evaporator frosted
3. Low-pressure pipe in
trouble
(Cracked or clogged)
4. Expansion valve is
clogged
1. Refrigerant overcharged
1. Refrigerant too short
1. Temperature motor
damaged
2. Temperature control dial is
damaged
3. Wiring harness connector
is disconnected
1. Cable wrongly set
2. Cable is disconnected
Solution
Charge battery.
Check and repair wiring.
Replace relay.
Replace coil.
Check and repair wiring.
Check with manifold gauge.
Clean condenser.
Check with manifold gauge.
Check with manifold gauge.
Replace compressor.
Replace compressor.
Replace low-pressure pipe.
Check with manifold gauge
Replace expansion valve.
Check with manifold gauge.
Clean or replace evaporator.
Replace low-pressure pipe.
Replace expansion valve.
Check with manifold gauge.
Check with manifold gauge.
Replace temperature motor.
Replace heater panel assembly.
Repair or replace wiring harness.
Repair cable.
Repair cable.
10-S3
CABIN
Reference
Page
G-29
10-S45
–
10-S28
10-S45
–
10-S13
G-32
10-S13
10-S13
10-S44
10-S44
10-S49
10-S13
10-M7
10-S13
10-S48
10-S49
10-M7
10-S13
10-S13
10-S27
10-S24
–
–
–
KiSC issued 11, 2014 A