You will lose some cooling capacity with R134a.  From what I've read,
the Vanagon AC system has capacity to spare, so it might not really be
an issue, maybe unless you're in a really hot climate.

In other cars (e.g. Mercedes) where the cooling was barely adequate with
R12, the R134a is not a good idea.

Allan
--
1991 Vanagon GL

Mike <mbucchino@CHARTER.NET> writes:

> ....or convert to R134A.  I've read that the old oil can't be fully
> removed, and when you add the new oil, they mix and make a
> difficult-to-remove coating, which helps to seal the pores in hoses.
> Or you could replace all the hoses with barrier hoses.  I'd recommend
> that you just do the conversion first, and then wait to see how well
> it holds, before changing the hoses, due to the expense and
> difficulty.
>
> Mike B.
>