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What oil comes in an Alma Products A6 compressor?

bigodave on Sun July 13, 2008 2:19 AM User is offline

Year: 1976
Make: Chevrolet
Model: C20
Engine Size: 350
Refrigerant Type: R134a
Ambient Temp: 100
Pressure Low: ?
Pressure High: ?
Country of Origin: United States

I just had a new Alma Products A6 compressor and a new dryer installed on my truck's A/C system, and at the last minute decided to go with R134a, instead of R12. The technician said that to convert to R134a he only had to install a different charging valve and charge the system with R134a. On the compressor body there is a tag that indicates that the compressor comes with 10oz of oil already installed. The tag also shows a warning that the there is R12 under high pressure.

My questions are these:

Isn't a different oil supposed to be used with R134a versus R12?

If the compressor comes with oil already installed, and also has a sticker on it indicating that it is intended for R12, wouldn't it then have oil in it that is not compatible with R134a?

The technician did not remove the installed oil before charging the system with R134a... should I have him vacate the system and drain the oil out of the compressor?

If so, what oil should be used, and should it refilled with 10oz of it, or does the use of R134a call for less?

Finally, should the system be charged with the same quantity of R134a as R12? I believe the specs for this system are 5.5lbs of R12.

Thanks, in advance, for your help!

Dougflas on Sun July 13, 2008 5:35 AM User is offline

You need to flush the system and add Bava 100 POE oil. R12 systems use mineral oil. To convert from R12 to R134, you should add a high pressure cut out switch to the high side. Unfortunately, there are too many converted systems out there done 1/2 way.

Edited: Sun July 13, 2008 at 5:36 AM by Dougflas

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