Cooling Fans have one main function, to cool the condenser and radiator by pulling air through the front of the vehicle. This helps cool the high pressure gas refrigerant as it passes through the condenser, returning it to a cooler liquid form. If the fan were to fail or reduce in efficiency, this would result in the high pressure refrigerant never being cooled and causing the compressor to fail due to high head pressure. When the vehicle is at low speed or idle the air flow would not be sufficient to cool the refrigerant resulting in poor performance.
Four Seasons UK are able to offer an extensive range of fans, relay kits etc to cover customer requirements including non-common failure, to the top selling parts.