| No refrigerant in air conditioning system (no pressure registered on gauges) |
|
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| Air conditioning compressor clutch not engaging |
- Air conditioning compressor clutch circuit short circuit to ground, short circuit to power, open circuit, high resistance
- Refrigerant undercharged
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- Refer to the electrical circuit diagrams and check the air conditioning compressor clutch circuit for short circuit to ground, short circuit to power, open circuit, high resistance
- GO to Pinpoint Test B .
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| Air conditioning inoperative (no change in pressure when setting the air conditioning to on) |
- Climate control system fault
- Air conditioning compressor internal failure
|
- Using the manufacturer approved diagnostic system, check the automatic temperature control module for related DTCs and refer to the relevant DTC index
- GO to Pinpoint Test C .
|
| Air conditioning operates briefly and then switches off |
- Electric cooling fan inoperative
- Air conditioning condensor airflow obstructed
- Refrigerant overcharged
|
- Check the operation of the electric cooling fan
- Check the air conditioning condensor for external obstructions
- Using the manufacturer approved equipment, recover the refrigerant. Evacuate and recharge the air conditioning system with the correct quantity of refrigerant and oil
|
| High and low pressure system pressures unstable |
- Refrigerant contaminated
- Air conditioning compressor internal failure
|
|
| High and low pressure system pressures normal
and insufficient cooling |
- Excessive volume of oil in the refrigerant or refrigerant contaminated
|
- Using the manufacturer approved equipment, recover the refrigerant. Evacuate and recharge the air conditioning system with the correct quantity of refrigerant and oil
|
| High and low pressure system pressures too high |
- Electric cooling fan inoperative
- Air conditioning condensor airflow obstructed
- Thermostatic expansion valve internal failure
- Refrigerant overcharged
- Air conditioning compressor internal failure
|
|
| High and low pressure system pressures too low |
- Refrigerant undercharged
- Low pressure pipe damaged/restricted
|
|
| Low pressure system pressure too high
and high pressure system pressure too low |
- Air conditioning compressor electronic control valve circuit short circuit to ground, short circuit to power, open circuit, high resistance
- Air conditioning compressor electronic control valve internal failure
|
|
| Low pressure system pressure too low
and high pressure system pressure too high
and frost present on the liquid pipe from the condensor |
- Liquid pipe from the condensor is restricted
- Receiver drier restricted
|
- Check the liquid pipe from the condensor for damage and restrictions. Install a new pipe as necessary
- Install a new receiver drier as necessary
|
| Noise from air conditioning system |
- Air conditioning compressor pulley bearing Air conditioning compressor pulley foul condition
- Air conditioning compressor clutch operation excessively noisy
- Air conditioning compressor internal failure
- Thermostatic expansion valve internal failure
- Refrigerant undercharged
- Refrigerant overcharged
- Air conditioning pipe (s) fouling body
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