I recently had my A/C in my 1986 Buick T Type converted to R134 from R12.. Before the swap I was running cool but not cold. After the swap I was told I may be leaking from my compressor as it showed signs of oil leakage. Long story short I now have NO cold air and a guage check indicates NO Freon in the system. Is this possible or have I been had? I was told I might need a new compressor but the sudden change is kind of dramatic.