Can you mix r134a and r12 in a 93 Buick lesabre?

No, you should not mix R134a and R12 refrigerants in a 1993 Buick LeSabre or any other vehicle. Mixing these refrigerants can lead to system damage and reduced efficiency, as they have different chemical properties and pressure requirements. If you need to convert from R12 to R134a, it's essential to properly evacuate the system and replace any necessary components to ensure compatibility. Always consult a professional for refrigerant conversions.