This question comes up sometimes because 4 Seasons (Factory Air) includes a tag with their pre 1994 application compressors that saysQuote
You certainly did your homework, and are absolutely right. The control valve for R-134a destrokes the V5 at a lower pressure. And you're also right that the control valve isn't changed with most retrofits... and for that matter neither is the accumulator and in all too many cases the oil, but it doesn't make it right. The control valve should be correct for the application, either R-12 or R-134a.
By the way, I don't think GM recommends changing the control valve because they don't recommend retrofits to begin with.
I can see why you'd hesitate on replacing the control valve... at $120 or so list, they're not cheap.
GM also has a special PAG oil to be used when a R12 V5 is retrofitted to R134a. It's p/n 12346292, ACDelco 15-100 but at $1.25 an oz wholesale, I'll bet not too many use that either.
Last year I did a job that got a reman V5. I test out all the cars I do on the road in npth city and highway. I found the vent temps to be terrible for a new compressor and was quite disappointed as the job had been a pill.
After thinking about it a bit I realized that the only thing it could be was the control valve. Like yourselves I looked one up - no stock and more then $100 :-(
I took a gamble on it and pulled the old one off the core and installed it in the reman compressor - bingo! Proper vent temps (like you should get with a new compressor). If I remember right the vent temps with the reman control valve were about 11c on the road and with the old unit it pulled down to 6c which is about what I usually see with reman compressors on most GM's.
So, just to give my .02 cents worth, I found the difference between the two to be very noticeable and comparable to and old comressor with lots of miles versus a fresh one.
Best & Thanks;
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