We sometimes receive questions from owners wondering what type of refrigerant is in their air conditioning system.  Cars manufactured prior to 1995 originally came with R-12 Freon, a refrigerant that was discontinued due potential ozone damage.  Cars manufactured after 95, and older systems requiring re-charging contain a more ozone friendly refrigerant known as 134a.  Questions about system refrigerants arise when it isn’t clear if the ac system has ever been recharged.  The following customer e-mail is case in point: (more…)