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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
BODIES AND CABS
TROUBLE SHOOTING GUIDE (Continued)
Problem
Possible Cause
High Head Pressures.
1. Excessive refrigerant charge.
(Discharge Side)
2. Air in system.
3. Engine overheated.
4. Condenser air flow restricted.
5. Flooded evaporator (indicated by heavy frosting of
suction line).
6. Kinked lines.
7. Defective fan drive or fan drive switch.
Low Head Pressure
1. Insufficient refrigerant charge.
(Discharge Side)
2. Defective compressor valves.
High Suction Pressure
1. Expansion valve sensing tube not tightly secured to
(Suction Side)
evaporator discharge line (compressor suction line).
2. Leaking or broken compressor valves.
3. Compressor drive belt slipping.
4. Magnetic clutch slipping.
5. Expansion valve not closing.
6. Faulty expansion valve.
Low Suction Pressure
1. Insufficient refrigerant.
(Suction Side)
2. Restriction at filter-dehydrator or in lines.
3. Expansion valve feeler bulb charge low.
4. Expansion valve capillary tube broken or charge lost.
5. Expansion valve blocked.
6. Moisture freezing in expansion valve.
7. Expansion valve sticking.
8. Moisture-saturated filter-dehydrator unit.
Automatic System Shutdown.
1. Defective low pressure switch.
2. Low refrigerant charge.
3. Excessive discharge pressure.
4. Ambient temperature too low.
5. Blown fuse.
CTS-2731 Page 44
PRINTED IN UNITED STATES OF AMERICA
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