There should not be any air in the system. The system will need to be recovered, evacuated and recharged to the manufactures specifications. in order to do this it is necessary to have a vacuum...
Check all of the following.................
1. Freon level in system.
2. Pressure switches and relays.
3. Controller head.
4. Power and ground going to the compressor clutch.
First you need to check the PSI level to make sure you need to recharge it and that its not another issue. You can purchase products at almost any automotive store or retail discount stores to do...