Where do you put freon in a 2000 mercury grand marquis?

To add Freon to a 2000 Mercury Grand Marquis, locate the low-pressure service port on the AC system, which is typically found near the accumulator or the firewall. Remove the cap from the service port, attach the refrigerant gauge and hose, and then add the appropriate type of refrigerant. Be sure to check the system pressure with the gauge to avoid overcharging. Always follow safety precautions and consult the vehicle's manual for specific instructions.