If your unit has a freon leak and a local tech tries to vacuum and recharge it have him use the chart that is on page 5 that Joe posted on cruise airs demistified.Cruise airs are very sensitive to freon charge or undercharge.If there is a sight glass it should always have bubbles when the compressor is running,unlike home or automotive AC units.Cruise airs are fairly basic and many parts can be found at local supply houses.