In a 2003 Saturn L200, the Freon (refrigerant) is taken in through the AC system's low-pressure service port. This port is typically located on the larger diameter aluminum line running from the evaporator to the compressor, usually found near the driver’s side of the engine bay. To check or add Freon, you'll need to connect a refrigerant gauge to this port. Always ensure the car is off and properly ventilated when servicing the AC system.
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