Does 2001 Lincoln Navigator have r-12 or 134a?

The 2001 Lincoln Navigator uses R-134a refrigerant for its air conditioning system. R-12 was phased out due to environmental concerns, and vehicles manufactured after the mid-1990s, including the Navigator, typically transitioned to R-134a. If you're servicing the A/C system, it's important to use the correct refrigerant type.