134 a causes testicular cancer. it can kill you in five minutes if your evaporator under the dash leaks and you breath the invisible odor-free fumes. at one time i lived in al. and they sell duracool, a ozone friendly, non-toxic, r-12 compatible product. i used it in my 83 240d when it was a little week on the cold air. I ran the car for four years after the recharge with no bad side effects. air temp would go as low as 28 degrees. mark