What kind of freon does a 2.5 engine use on a Nissan altama two thousand six modle

Hello, the refrigerant used in a 2006 Nissan Altima is R134a. That said, do not attempt to work with refrigerants, or "charge" the system in your car. If it's needing refrigerant, it leaked -- which needs repaired before charging. Damage to the atmosphere can happen and ineffective repair efforts can likely occur if you try to "charge" the system. Seek guidance at a local shop near you. They have the proper equipment to handle refrigerants and test the system as needed. www.repairpal.com/repair-shops