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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
BODIES AND CABS
TROUBLE SHOOTING GUIDE (Continued)
Problem
Possible Cause
Compressor Noise and
1. Worn, loose or misaligned compressor drive belt.
Vibration.
2. Loose compressor clutch.
3. Foreign material or damaged parts in compressor.
4. Damaged clutch.
5. Loose or broken mounting bracket.
6. Excessive refrigerant charge.
7. Compressor oil level below minimum.
Engine Overheating.
1. Low radiator coolant level.
2. Clogged engine cooling system.
3. Debris-laden condenser and radiator.
4. Inadequate engine cooling system.
5. Excessive refrigerant charge.
6. Broken or slipping fan belt.
7. Faulty engine thermostat.
8. Radiator shutters stuck shut.
9. Faulty water pump.
10. Collapsing or obstructed radiator hoses.
11. Faulty, fan drive system.
Excessive Compressor
1. Incorrect belt tension.
Drive Belt Wear.
2. Incorrect belt alignment.
3. Slippage due to excessive refrigerant charge.
4. Cord fracture due to forcing belt into place.
5. Broken or nicked pulley.
6. Excessive oil on belt.
Compressor Clutch
1. Blown fuse.
Inoperative.
2. Loose connection or broken wire.
3. Faulty field coil.
4. Faulty thermostatic control switch.
5. Broken drive belt.
Clutch Slippage.
1. Excessive head pressure.
2. Loose pulley.
3. Oily drive belt.
4. Worn drive belt.
Unit Blower Motor
1. Blown fuse.
Inoperative or Operate
2. Loose connection.
Slow.
3. Broken wire.
4. Defective switch.
5. Faulty resistor.
6. Motor shaft bound.
CTS-2731 Page 43
PRINTED IN UNITED STATES OF AMERICA
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