How do you put freon in a Scion?

To add Freon ( refrigerant) to a Scion, first ensure the engine is off and the air conditioning system is off. Locate the low-pressure service port, which is typically found on the larger diameter A/C line. Using a refrigerant charging kit, connect the hose to the port, start the engine, and turn on the A/C to the maximum setting. Follow the instructions on the refrigerant can to dispense the appropriate amount, ensuring you do not overfill the system.