The car's air conditioning system functions to condition the air, which means whilst cooling the air in the car down, it also helps to ensure there isn't too much moisture in the car, so it stops the air getting too humid.  The car's air conditioning unit also cleans the air in the car by filtering the dust and other particles from the air inside the car.

The aircon radiator, also referred to as a aircon condenser is fixed in front of the engine's radiator, looking a lot like a smaller version of the radiator.

Hot gas or vapour is pumped from the aircon compressor into the aircon radiator where it is cooled and turned back into a really cold liquid which is pumped into the aircon evaporator and flows into the car as cold air. This whole process is then repeated over and again.

Naturally, issues can arrise with the aircon radiator. A common reason for loss of refrigerant vapour/gas in the air conditioning system is the failure of the air conditioning radiator. If there is insufficient cold air it could be a clogged aircon radiator. Situated in front of the engine's radiator the aircon radiator is an easy target for rust and a buildup of dirt which can cause this part to malfunction.