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computer_engineer
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JUL 22, 12:40 AM
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What kind of oil should I get once the old stuff is flushed out and I get ready to put in R-134a into the system? I know it is PAG, but what about PAG 150???
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fierofool
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JUL 22, 08:06 AM
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With much helpful guidance from RDPLZ, I just had my compressor replaced. The first new compressor came with an 8 oz bottle of oil, but it was unmarked and there was no information with the compressor about what weight or even what type oil it was. I had to return it because it had the wrong pulley. I next purchased a 4 Seasons reman compressor. Literature in it stated that PAG 150 should be used when converting to R134a.
Something that should be noted is that AutoZone had 2 HR6 compressors. One was listed as being compatible with R12 while the one I purchased stated it was for R12 or R134a. I suppose that's because of the parts used inside. Ester oil was recommended for the R12 compressor.
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RWDPLZ
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JUL 22, 09:06 AM
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| quote | Originally posted by fierofool:
Ester oil was recommended for the R12 compressor. |
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For R-12, should use 525 viscosity mineral oil. Ester oil is used for R-134A conversions where you can't remove all of the mineral oil, because of issues with mineral oil and PAG mixing. Some people swear by it, but no manufacturers use it. If the system is flushed and mostly clean, PAG works fine.
From GM TSB #33-12-26
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RESIDUAL MINERAL OIL
"THE CONCERN THAT MINERAL OIL IS CHEMICALLY INCOMPATIBLE WITH R-134A AND/OR PAG LUBRICANT HAS BEEN PROVEN TO BE UNTRUE. A NORMAL CHARGE OF MINERAL OIL LEFT IN THE A/C SYSTEM AFTER A RETROFIT TO R-134A WILL NOT DAMAGE THE SYSTEM. MINERAL OIL, HOWEVER, DOES NOT MIX WELL WITH R- 134A, AND WILL NOT PROVIDE ADEQUATE LUBRICATION. TESTS ON BOTH THE ORIFICE TUBE AND TXV SYSTEMS SHOW THAT THE MINERAL OIL PARKS IN PLACES SUCH AS THE ACCUMULATOR, AND DOES NOT APPRECIABLY AFFECT PERFORMANCE OR DAMAGE THE SYSTEM."
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The difference between PAG46, PAG100, and PAG150 is viscosity. Think of it as 5W30, 10W30, and 10W40. What you should use depends on the compressor. If you buy a new or reman compressor, check the documentation or ask the manufacturer. They usually come with oil in them already, so you don't want to mix types. Some new compressors have tighter tolerances, and will use PAG46 instead of PAG150. For remans or rebuilding/resealing old HR6 compressors yourself, PAG150 works well.
Total system capacity for the Fiero is 8oz
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Dennis LaGrua
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JUL 22, 09:50 AM
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On my R-134a conversions I have always used Ester oil. It has always worked well without issues. I would only use PAG in a completely clean system or one that originally used it.. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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computer_engineer
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JUL 23, 03:01 PM
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| quote | Originally posted by Dennis LaGrua:
On my R-134a conversions I have always used Ester oil. It has always worked well without issues. I would only use PAG in a completely clean system or one that originally used it..
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What if R-134a was added to an R-12 system? This is what happened to me when I first got the car years ago (stupid is an understatement). The A/C came back to life and made cool air for 2 - 3 years, but after that, not so much. Last time I took a look at it and connected my gauges, there was too much pressure, like it was clogged at the dryer. I hit the low side valve and some of the oil came out - it as blackish in color. I assume this is from the PAG in the R-134a re-charge bottle (if that is what was in there - I dunno), and the mineral oil, mixing in the system. I need to flush that stuff out of there, and then put in some oil that is compatible with R-134a. There is no guarantee that I will get all of the mineral oil or PAG out, so what is the best oil to use in a situation like this?[This message has been edited by computer_engineer (edited 07-23-2018).]
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computer_engineer
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JUL 23, 03:33 PM
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2.5
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JUL 23, 03:43 PM
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| quote | Originally posted by Dennis LaGrua:
On my R-134a conversions I have always used Ester oil. It has always worked well without issues. I would only use PAG in a completely clean system or one that originally used it..
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From what I have heard Ester is the one that plays well with other oils.
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2.5
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JUL 23, 03:49 PM
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| quote | Originally posted by computer_engineer:
Can anyone tell which compressor this is by these photos?
...
From google and a few other postings on PFF, it seems like it might be a DA6, but based on the manufacture date of the car, it should be an HR6. 
Thoughts?
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Helpful thread
Page 2 says the HR6 is an upgrade for the DA6
http://www.fiero.nl/forum/Forum2/HTML/107037.html[This message has been edited by 2.5 (edited 07-23-2018).]
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computer_engineer
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JUL 24, 08:55 PM
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Thinking of replacing my perfectly good working DA6 compressor with an HR6 remanufactured or other new compressor. Does anyone have a line on where to get a low cost remanufactured HR6, or know of a new one that is a "drop-in" replacement? [This message has been edited by computer_engineer (edited 07-24-2018).]
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RWDPLZ
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JUL 24, 09:22 PM
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