Update:
I finished the A/C conversion a few days ago. All new seals and orifice tube, but same H6 compressor and even the same accumulator. Vacuumed for an hour. Put in 8.5 oz ester oil, and roughly 30-32 oz 134a. It works unbelieveable good:
45°F at the vent left of the steering wheel. This is my most successful conversion. (that is if it doesn't start leaking).
Thnaks for the tips.
Also, see post 1988 DeVille: is 4.5L best?
Bill
Thanks for the input. I missed this reply because of the engine failure in
>previous posts. 134a conversion is next.
>
>On Mon, 8 Mar 2004 10:20:21 -0600 (CST), snipped-for-privacy@webtv.net wrote: >
>>>Has anyone sucessfully converted this
>>>car to 134a?
>>
>>6 yrs ago I converted my DeVille to 134A. I got the car and the
>>compressor was shot, so I decided to go with 134A even though I had
>>enough R12 to do that job.
>>I changed the orfice tube, accululator and all the o-rings. The new
>>compressor was rated to work with either R12/R134A, so I installed PAG
>>oil for the 134A. I presssure flushed the complete tubing system with
>>denatured alcholol, and then vacuumed the system down. I left it alone
>>for 12+ hrs, with the gauges attached, to make sure there were no
>>leaks, and then added 80% of the original R12 charge. It's been putting
>>out 42° air in our hot Texas summers ever since. With the cost of the
>>new compressor, I spent less than $250 on the conversion.
>>
>>Dave S(Texas)