My aircon shat itself about a year ago because i never used it, which causes the seals to dry out. Now it's summer i really want it going again, particularly since my car is black. An aircon place here in Cairns told me that sending mine off to be rebuilt (in Brisbane) and back on my car will take about a week and $1500. I asked if i should buy a 2nd hand one off ebay and hope it was in working order and he warned me that any aircon that has been off the car for a while (as unused) is likely to seize up anyway because of the seals, and will therefore require a rebuild in most cases anyway. As my car is simply my weekend warrior i have no problem losing it for as long as it takes but if you need your car day to day perhaps buy one and have it freshened up first, then book the car in to have the work done when convenient. I have watched compressors go off on ebay for $30.