Aveo 2004-2005

Recovery & Recharging


Refer to the applicable precautions for this system before performing the following operation. Failure to follow the warnings and cautions could result in possible personal injury or death.

The efficient operation and life of the air conditioning system is dependent upon the chemical stability of the refrigeration system. When foreign materials, such as dirt, air, or moisture, contaminate the refrigeration system, they will change the stability of the refrigerant and the polyalkaline glycol (PAG) compressor oil. They will also affect the pressure-temperature relationship, reduce efficient operation, and can possibly cause interior corrosion and abnormal wear of moving parts.

Observe the following practices to ensure chemical stability in the system:

Wipe away dirt or oil at and near any connection before opening that connection. This will reduce the chance of dirt entering the system.
Cap, plug, or tape both sides of a connection as soon as possible after opening the connection. This will prevent the entry of dirt, foreign material, and moisture.
Keep all tools clean and dry, including the manifold gage set and all replacement parts.
Use a clean and dry transfer device and container to add PAG refrigerant oil. This will ensure that the oil remains as moisture-free as possible.
Have everything you need ready to allow you to perform all operations quickly when opening an A/C system. Do not leave the A/C system open any longer than necessary.
Have everything you need ready to allow you to perform all operations quickly when opening an A/C system. Do not leave the A/C system open any longer than necessary.
Evacuate and recharge any A/C system that has been opened.

All service parts are dehydrated and sealed before shipping. They should remain sealed until just before making connections. All the parts should be at room temperature before uncapping. This prevents condensation of moisture from the air from entering the system. Reseal all parts as soon as possible if the caps have been removed but the connections cannot be made promptly.

Use only refillable refrigerant tanks that are authorized for the charging station being used. The use of other tanks may cause personal injury or void the warranty. Refer to the Manufacturer's instructions for the charging station.

A charging station discharges, evacuates, and recharges an air conditioning system with one hook-up. Filtering during the recovery cycle together with filtering during the evacuation cycle ensures a supply of clean, dry refrigerant for A/C system charging.

Never use the R-134a charging station on a system charged with R-12. The refrigerants and the oils are not compatible and must never be mixed in even the smallest amount. Mixing refrigerant residue will damage the equipment.

Never use adapters which convert from one size fitting to another. This will allow contamination which may cause system failure.

A/C Refrigerant System Oil Charge Replenishing

Any oil removed from the A/C system during the recovery process must be replenished at this time. Use the correct graduated bottle of PAG oil for the R-134a system.

Keep the oil bottles tightly capped at all times to protect the oil from moisture and contamination.
Never open the oil injection valve while there is positive pressure in the A/C system. This will result in oil blow-back through the bottle vent. You must have A/C system vacuum for this operation.
Never let the oil level drop below the pick-up tube while charging or replenishing the system. This will allow air into the A/C system.

  1. Refer to the manufacturer's instructions for the charging station in use. Add the proper amount of PAG oil to the system.
  3. Close the valve when the required oil charge has been pulled into the system.

Charging System Setup And Maintenance

Refer to the manufacturer's instructions for all initial setup procedures and all maintenance procedures. There are many charging stations available. All perform the various tasks required to discharge the system and recover refrigerant, evacuate the system, add a measured amount of oil, and recharge an air conditioning system with a measured amount of refrigerant.

Control Panel Functions

A charging station will have controls and indicators to allow the operator to control and monitor the operation in progress. Refer to the manufacturer's instructions for details. These can be expected to include:

Main power switch -- The main power switch supplies electrical power to the control panel.
Display -- The display shows the time programmed for vacuum and the weight of the refrigerant programmed for recharging. Refer to the manufacturer's instructions for detailed programming information.
Low-side manifold gage -- This gage shows the system's low-side pressure.
High-side manifold gage -- This gage shows the system's high-side pressure.
Controls -- This will contain the controls that control various operating functions.
Low-side valve -- This valve connects the low side of the A/C system to the unit.
Moisture indicator -- This indicator shows if the refrigerant is wet or dry.
High-side valve -- This valve connects the high side of the A/C system to the unit.

Successful Transfer Complete

  1. Close the high-side valve on the unit's control panel. Both valves should be closed.
  3. Start the vehicle and the A/C system.
  5. Let the engine run until the readings on the high-side and low-side gages stabilize.
  7. Compare the readings to the system specifications.
  9. Check the evaporator outlet temperature to ensure that the A/C system is operating within the system specifications.
  11. Keep the A/C running.
  13. Close the high side coupler valve.
  15. Disconnect the high-side hose from the vehicle.
  17. Open the high-side and low-side valves on the control panel. The system will quickly draw in refrigerant from both hoses through the low-side hose.
  19. Close the low-side coupler valve.
  21. Disconnect the low-side hose from the vehicle.

Unsuccessful Transfer

Sometimes the total charge does not transfer into the A/C system. There are 2 reasons why this may occur.

The pressure in the unit's tank and the pressure in the A/C system are roughly equal. This will cause the transfer to proceed too slowly. Refer to the manufacturer's instructions for the charging station in use.
There was not enough refrigerant in the unit's tank to transfer the full charge. It is necessary to recover the partial charge of refrigerant from the vehicle and evacuate and charge the A/C system again. Refer to the manufacturer's instructions for the charging station in use.