ok these are 2 separate issues I'll start from the air bags since thats the most complicated one to fix.. This is a common problem ,, basically there is a device called a clock spring in the steering wheel, this device is like a bearing with a coil that turns with the steering yet allows the air bag in the steering to be powered. Now this has brushes and wires and a bearing fitted in such a manner the steering can turn freely without breaking contact. Well eventually the wires break and it needs replacing. This involves removing the steering and replacing the spring. I strongly suggest you get a professional to do this as there is no room for error reasons being
- the clock spring needs to be set propperly 1 1/2 turns left and 1 1/2 turns right if not your steering will not function as it should and you wont be able to make turns left or right and over turn on the other end (big problem) as it can lead to accidents.
- you can discharge the air bags and that's bad as its expensive to replace, not mention your air bags use gun powder to discharge ,, this can cause critical injuries m burns etc..
- if the wiring is wrong , you can blow the ecu as the ecu directly controls the air bags on a 12 volt relay.. Well i guess you get the point.
now for your ac,, once you have the unit refilled ,, the ecu wont recognize it is and basically will keep displaying the error code similar to that of your air bag sensor, what you need to do is get a diagnostic unit ,, this will connect to the ecu and clear all error codes, the system will then reboot and if there is no problems bot warning lights will go off, if the problem isnt resolved then they will reappear. I highly recommend taking it to a local mechanic to get this done,, by all means in you have a tool, you may attempt it your self,, just be careful you dont change any of the other settings.. If you dont ,, dont bother buying a unit since a mechanic will be cheaper..