I mostly agree with F1-Bob as far as 134 conversions go on MOST cars. There are many cars that are good candidates for 134 conversion, and there are many cars that are not for various reasons.

The 123's are marginal, but if done properly can get by. The 124's are not good candidates at all. The two components that need to be considered when deciding on conversion are basically condensor and compressor. The condensor must have adequate thermal capacity and the compressor must be of a type that will both seal with 134 AND be durable with the additional high pressure requirements.

Note that I said for 134 conversion. I have converted a number of various vehicles to 134, one of which I have since reverse converted to go BACK to 12. What I personally WON'T do is use an alternative such as DuraCool, Freeze 12, etc.

The only two refrigerants that I will even consider are 134 and 12.

Have a great day,