I think I figured out how the AC is controlled on this car and was hoping that someone could confirm whether I got it right. As I understand it, the AC compressor is an on/off affair. If the system calls for full cooling the monovalve stays shut and the compressor stays on. If the system calls for cooling at less than full cooling capacity, it turns the compressor on and then modulates the monovalve open to let some hot water go through the heating coil. If the system calls for no cooling or for heat, the compressor turns off.

Am I close?

I am not concerned with how it controls the compressor for defrosting, I just want to know what happens with respect to cooling and heating.