24 - 12 HEATING AND AIR CONDITIONING |
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refrigerant is conserved in the system. The valve is |
For (HPR) valve replacement, refer to Variable Dis- |
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calibrated to vent at a pressure of 3100 to 4140 Kpa |
placement Compressor Service Procedures. |
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(450 to 600 psi). If a valve has vented a small amount |
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of refrigerant, it does not necessarily mean the valve |
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is defective. |
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FIXED DISPLACEMENT COMPRESSOR AND COMPONENTS DIAGNOSTIC |
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PROCEDURES |
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INDEX |
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Clutch Coil Tests . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
High Pressure Relief Valve (HPR) Diagnosis |
. . . . . 17 |
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Compressor Clutch Inoperative . . . . . . . . . . . . . . . |
12 |
Low-Pressure Cut-Off Switch Diagnosis . . . |
. . . . . 14 |
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Compressor Identification . . . . . . . . . . . . . . . . . . . |
12 |
Silver Expansion Valve Test . . . . . . . . . . . . . |
. . . . 15 |
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Compressor Noise . . . . . . . . . . . . . . . . . . . . . . . . |
12 |
Thermal Limiter SwitchÐModel TR105 |
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Fin-Sensing Cycling Clutch Switch Diagnosis . . . . |
15 |
Compressor . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 14 |
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Fixed Displacement Compressor Refrigerant System . |
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COMPRESSOR IDENTIFICATION
Fig. 1 Fixed Displacement CompressorÐModel
10PA17
COMPRESSOR NOISE
Excessive noise that occurs when the airconditioning is being used, can be caused by:
²Loose bolts
²Mounting brackets
²Loose clutch
²Excessive high refrigerant system operating pressure
Verify compressor drive belt condition, proper refrigerant charge and head pressure before compressor repair is performed.
Fig. 2 Fixed Displacement CompressorÐModel
TR105
For noise diagnostic procedures, refer to the Compressor Noise and Compressor Clutch Diagnosis chart in this section.
COMPRESSOR CLUTCH INOPERATIVE
The air-conditioning compressor clutch electrical circuit is controlled by the engine controller. The controller is located in the engine compartment outboard of the battery.
If the compressor clutch does not engage: Verify refrigerant charge.
If the compressor clutch still does not engage check for battery voltage at the low pressure or differential
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HEATING AND AIR CONDITIONING 24 - 13 |
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