A/C Condenser is basically a radiator positioned between the car's grille and the engine-cooling radiator in which the gaseous refrigerant sheds heat and returns to a liquid state. It radiates the humid air that’s sucked into the air compressor. Then it depressurizes, cools and liquefies that air, finally sending it to the dryer.
Signs of a malfunctioning condenser include fluid leaks, cracked tubes, eroded fins, clogs or insufficient coolness from the A/C vents. Like evaporators, condensers are also susceptible to external blockage, mostly from things like leaves, insects, or even dust.