Jaime,

To go to 134a or to Freeze 12 - either one - you must have installed the
valves and fillers for the 134a.  The other thing to know is that if you
run the 134a in your old system for very long at all, you will most
likely wreck your compressor. The old compressors were not designed to
handle the head pressure that is required for use of 134a. The freeze 12
runs at lower pressures.

John Rodgers
88 GL Driver

JAIME E FORERO wrote:
> Thanks all.  I gather that the conversion to 134a can be made without major component modification. Going to freeze 12 required no modifications. I am tempted to try the 134a.
> Any thoughts??  Has anyone in this forum used freeze 12??
> Cheers
> Jaime
>
>
> --- On Sat, 10/4/08, Richard A Jones <jones@COLORADO.EDU> wrote:
>
>
>> From: Richard A Jones <jones@COLORADO.EDU>
>> Subject: Re: AC does loses freon
>> To: vanagon@GERRY.VANAGON.COM
>> Date: Saturday, October 4, 2008, 10:35 AM
>>
>>> 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.
>>
>> My version was "the old oil has sealed all the pores
>> over the
>> years...."  Hard facts are really hard to come by with
>> AC.
>>
>> I converted my '87 from non-functioning R12 to R134a.
>> They
>> tested for leaks, then evacuated and converted.  It worked
>> fine--
>> plenty cool--for 2-3 years until one winter when I could
>> not
>> run it monthly.  The compressor seals dried and it leaked.
>> New seals, and now it has run cold for a couple of summers.
>>
>> One of my smug pleasures is running the AC while grinding
>> along
>> some Syncro road in granny low while the ATVers eat dust.
>> ;-)
>>
>> Running monthly year-round is one key to staying cool.
>>
>> Richard
>>
>
>
>