[12Ounce]

I will give you a bit of a primer ... but you will find much on this forum by searching.

Yes: there is only one compressor, and one condensor coil (near radiator) .. but a front and rear evaporator coil. So the two evaporator coils (the cooling coils) are in "parallel" ... the refrigerant is split into two streams supplying both coils. The evap coils are controlled differently so it is difficult to predict if both are at the same temperature ... touching each coil is the easiest way...or touching the steel tubing nearby.

But there is another important factor: at both the front and rear of the cabin, separate temperature controllers attempt to meet your selected temperature by mixing circulated air thru the cooling coil and the heater coil... this is done by movable "blend doors". Blend doors, actuators, etc ... all can be problems on their own.

Have fun!