Hi all, my ac is not blowing cold in my 2015 3.0 sdv6 sport autobiography, i noticed the connectors are different, i just ordered a set of connectors i will be pulling a vacuum, can someone tell me if i must used the 1234 freon or is it safe to use 134, i was told by someone that used 134 and said after 30,000 miles they have 0 problem. Can someone confirm? Thanks