Condition
| Possible Causes
| Correction
|
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For applications with a fixed displacement compressor, rapid A/C clutch cycling with poor panel outlet temperatures
| 1. Low refrigerant system charge
| 1. See Refrigerant System Leaks in this group (Refer to 24 - Heating and Air Conditioning/Plumbing/Diagnosis and Testing) . Test the refrigerant system for leaks. Repair, evacuate and charge the refrigerant system, if required.
|
Equal pressures, but the A/C clutch does not engage
| 1. No refrigerant in the refrigerant system
| 1. See Refrigerant System Leaks in this group (Refer to 24 - Heating and Air Conditioning/Plumbing/Diagnosis and Testing) . Test the refrigerant system for leaks. Repair, evacuate and charge the refrigerant system, if required.
|
2. Open fuse
| 2. See Wiring Information. Check the fuses in the Body Control Module. Repair the shorted circuit or component and replace the fuses.
|
3. Inoperative A/C clutch coil
| 3. See A/C Compressor in this group. Test the A/C clutch coil and replace, if required.
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4. Inoperative A/C clutch relay
| 4. See A/C Clutch Relay in this group. Test the A/C clutch relay and relay circuits. Repair the circuits or replace the relay, if required.
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5. Improperly installed or inoperative evaporator temperature sensor
| 5. See Evaporator Temperature Sensor in this group. Test the sensor and replace, if required.
|
6. Inoperative A/C pressure transducer
| 6. See A/C Pressure Transducer in this group. Test the sensor and replace, if required.
|
7. Inoperative Powertrain Control Module (PCM)
| 7. See Group 28 - DTC Based Diagnostics. Test the PCM and replace, if required.
|
Normal pressures, but A/C Performance Test air temperatures at center panel outlet are too high
| 1. Excessive refrigerant oil in system
| 1. See Refrigerant Oil Level in this group. Recover the refrigerant from the refrigerant system and inspect the refrigerant oil content. Restore the refrigerant oil to the proper level, if required.
|
2. Blend door actuator or cable inoperative or improperly installed
| 2. See Blend Door Actuator or Cable in this group. Inspect for proper operation and replace, if required.
|
3. Blend door(s) inoperative or sealing improperly
| 3. See HVAC Housing in this group. Inspect each blend door for proper operation and sealing. Repair if required.
|
The low side pressure is normal or slightly low, and the high side pressure is too low
| 1. Low refrigerant system charge
| 1. See Refrigerant System Leaks in this group (Refer to 24 - Heating and Air Conditioning/Plumbing/Diagnosis and Testing) . Test the refrigerant system for leaks. Repair, evacuate and charge the refrigerant system, if required.
|
2. Refrigerant flow through the A/C evaporator is restricted
| 2. See A/C Evaporator in this group. Replace the restricted A/C evaporator, if required.
|
3. Inoperative A/C compressor
| 3. See A/C Compressor in this group. Replace the compressor, if required.
|
The low side pressure is normal or slightly high, and the high side pressure is too high
| 1. A/C condenser air flow restricted
| 1. See A/C Condenser in this group. Check the A/C condenser for damaged fins, foreign objects obstructing air flow through the condenser fins and missing or improperly installed air seals. Clean, repair or replace components as required.
|
2. Refrigerant flow through the A/C receiver/drier is restricted
| 2. See A/C Receiver/Drier in this group. Replace the restricted A/C receiver/drier, if required.
|
3. Inoperative radiator cooling fan
| 3. See Group 7 - Cooling. Test the radiator cooling fan and replace, if required.
|
4. Refrigerant system overcharged
| 4. See Refrigerant System Charge in this group. Recover the refrigerant from the refrigerant system. Charge the refrigerant system to the proper level, if required.
|
5. Air in the refrigerant system
| 5. See Refrigerant System Leaks in this group (Refer to 24 - Heating and Air Conditioning/Plumbing/Diagnosis and Testing) . Test the refrigerant system for leaks. Repair, evacuate and charge the refrigerant system, if required.
|
6. Engine overheating
| 6. See Group 7 - Cooling. Test the engine cooling system and repair, if required.
|
The low side pressure is too high, and the high side pressure is too low
| 1. Accessory drive belt slipping
| 1. See Group 7 - Cooling. Inspect the accessory drive belt condition and tension. Tighten or replace the accessory drive belt, if required.
|
2. Inoperative A/C expansion valve
| 2. See A/C Expansion Valve in this group. Replace the A/C expansion valve, if required.
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3. Inoperative A/C compressor
| 3. See A/C Compressor in this group. Replace the A/C compressor, if required.
|
The low side pressure is too low, and the high side pressure is too high
| 1. Restricted refrigerant flow through the refrigerant lines
| 1. See Liquid Line, Suction Line and Discharge Line in this group. Inspect the refrigerant lines for kinks, tight bends or improper routing. Correct the routing or replace the refrigerant lines, as required.
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2. Restricted refrigerant flow through the A/C expansion valve
| 2. See A/C Expansion Valve in this group. Replace the A/C expansion valve, if required.
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3. Restricted refrigerant flow through the A/C condenser
| 3. See A/C Condenser in this group. Replace the restricted A/C condenser, if required.
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