Air Flow and the Condenser
The condenser receives high-pressure high-temperature vapor from the compressor and releases this heat into the cooler air passing through its fins. When the vehicle is idle, ram air is reduced and replaced by airflow from the engine's cooling fan. It's essential to maintain airflow through the condenser at stoplights. If the cooling fan is inoperative, airflow is restricted, and air conditioning performance is affected.
This reduced airflow is typically the result of a faulty fan clutch, or a faulty electric fan motor or circuit. Road debris clogs and damages the fins of the condenser, reducing its ability to exchange heat. Cleaning and straightening the condenser's damaged fins restores airflow through the condenser.
As shown in the illustration, the condenser and the radiator are close. Air flows through the condenser and the radiator. An overheating engine reduces the condenser's ability to function, and many PCM's prevent compressor clutch operation if the engine is overheating.