Originally Posted by BLK01
The metering device (for lack of better words) slows down the freon to change it back to a liquid state.
the metering device is a term used because there are numerous types such as a fixed bore,capillary tube,TXV,EEV etc.
the metering device turns liquid refrigerant into a mist(like misting your face with a spray bottle) to increase the surface area of the refrigerant allowing more heat to be absorbed into the refrigerant. this action turns the liquid into a gas state. after it turns into a gas it is now allowed to return to the compressor(you cannot compress a liquid) and be compressed into a high pressure hot gas. when the refrigerant cycles through the condenser it desuperheats and subcools the refrigerant turning it back into a high pressure liquid. this liquid is sent through the metering device again and the cycle continues.
to the OP. your system is low on refrigerant and it has a leak. leak needs to be fixed.