| No refrigerant in air conditioning system (no pressure registered on gauges) |
|
|
| 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
- Climate control system fault
- Air conditioning compressor clutch circuit short circuit to ground, short circuit to power, open circuit, high resistance
- Air conditioning compressor internal failure
|
- Refer to the appropriate system wiring diagrams and check the air conditioning compressor clutch circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new air conditioning compressor clutch as necessary
- GO to Pinpoint Test B .
- Using the manufacturer approved diagnostic system, check the automatic temperature control module for related DTCs and refer to the relevant DTC index
- Refer to the appropriate system wiring diagrams and check the air conditioning compressor clutch circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new air conditioning compressor clutch as necessary
- GO to Pinpoint Test C .
|
| Air conditioning operates briefly and then switches off |
- Electric cooling fan inoperative
- Air conditioning condenser airflow obstructed
- Refrigerant overcharged
|
- Check the operation of the electric cooling fan
- Check the air conditioning condenser 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 condenser 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 low
and high pressure system pressure too high
and frost present on the low pressure liquid pipe to the condenser |
- Low pressure liquid pipe restricted
- Receiver drier restricted
|
- Check the low pressure liquid pipe 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
- Air conditioning system blower fault
|
|
| Air conditioning evaporator odor |
- Incorrect type of evaporator filter fitted
- Water infiltration to the evaporator filter
|
- Remove the evaporator filter. Refer to: Pollen Filter
. Check the type of filter fitted. The correct filter is a particle filter NOT a carbon filter. If a carbon filter is fitted, replace the filter with a new particle filter. Clean the evaporator unit and filter housing before refitting the filter
- Check the filter is dry and has not been subject to any water damage. If the filter is wet or damaged, replace the interior filter with a new particle filter. Clean the evaporator unit and filter housing before refitting the filter
|
| Air conditioning evaporator leakage |
- Loose pipes or components
- Evaporator internal failure
|
- Perform an air conditioning system performance check (see above) to ascertain if the system is still pressurized. If there is pressure in the system, either a sniffertool or a UV light may be used to look for system leaks. If there is no pressure available, use a UV light to check for leaks
- Check the security of the fixings that fasten the air conditioning pipes to the thermostatic expansion valve. If the screws are loose, install new O-rings and refasten screws
- Check for leaks around the refrigerant pressure sensor. If leaks are detected install new O-rings and reinstall the refrigerant pressure sensor
- Remove the glove box and interior filter. Check for leaks from the evaporator core. If leaks are detected install a new evaporator as required
|
| Air conditioning blower defective |
- Blower motor circuit connections insecure
- Blower control module fault
- Blower wheel is blocked or jammed
|
- Check the blower motor power and ground circuits for circuit faults and rectify as required
- Check the operation of the blower control module and rectify as required
- Check that nothing is blocking or obstructing the blower wheel and rectify as required
|