A properly designed AC system will not turn on the compressor when the refrigerant has leaked out. When you add a small about of refrigerant to the low pressure side the pressure will increase enough for the compressor to come on.

Bruce Baxter wrote:
>
> Can anyone point me at resources for troublshooting the air
> conditioning in my '95 Eagle Vision?
>
> A copy of troubleshooting pages from a manual would be helpful ( I
> don't presently have a manual ) .
>
> The compressor isn't cycling on, and I need to know what the circuit
> that controls it looks like so I can check to see whether I've got
> broken wires, or a sensor that's not operating properly.
>
> I'm thinking it's probably something electrical/control related,
> because when I had problems with my '94 Voyager leaking, even when it
> was empty and I needed to add R134a, the compressor would cycle on so
> that I could begin the process of adding refrigerant.

--
Mike Walsh
West Palm Beach, Florida, U.S.A.