hi
did you leave the air con charged eveything i read up on when i was importing mine said to empty it then there is no problems or just get it serviced by a dealer with the correct
gas for australia, i think they pretty strict on it, im sure it on the customs web site.
i was lucky my air con is those famous front vents windows and land rover build quality around the door seals.
good luck.
as i have just done mine if you need any more help just ask, i imported to NSW not sure i will know the answers but may be able to help, make sure you get import papers ready for the blue slip, as the inspector at the garage would not release mine until i had my plates fitted