R12 to R134a conversion - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-13-2006, 06:44 PM   #1
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Default R12 to R134a conversion

Code 66 on ECC


So I assume I need a compressor to do the "job right" There are leaks in the system it appears so the R12 leaked out....I can easily obtain R12 on the blackmarket and my dad is Certified with different referigents, but not sure if it is worth the trouble...thinking I should just go to the shop and swap the compressor and redo the lines. But if I swap the compressor I would think other parts like the evaporator should be changed out as well.

Also how will the 93 ECC react when R134 is put into the system? Since R134a sucks I would think it might mess something up, with as little as I know about the complex climate control in these cars.
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Old 04-13-2006, 08:49 PM   #2
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Not sure how complex the systems are...

But I switched the system on my 91 over to R134a 6 years ago using a kit... I have given it one shot of 134... But I have noticed that the front seal is leaking refrigerant oil.. Can't talk bad about it tho as that compressor has givem almost 16 years of troublefree service.. And it still works, a little louder than it used to, but it still get nice and cool... I will most likely replace the Reciever drier, the orifice tube filter and the compressor this year...

Also converted the 92 Mitsu at the same time.. To this day it will still keep me cool on a 90F day...

Bus as far as the ECC goes I couldn't tell you..

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Old 04-14-2006, 10:52 AM   #3
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You don't need to swap the condensor and evaporator unless you suspect one or the other is leaking. You do, however, need to replace the receiver/dryer. My dad has done a lot of conversions on our tractors, and has never had any luck re-using old compressors with the new oil, so anymore he just buys a new compressor for the swap. I'm not saying you couldn't get by with your old one though.
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Old 04-15-2006, 03:16 AM   #4
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The compress can be expanse I think mine was like 350-450 range with core. I converted my car and it seems to be happy and blow plenty of cold air. On the side note I will not blow as cold as when was new. R134a system run a high compression from what I understand. As far as ecc I don't think it would really care form what I know it check the temp come out and the air temp on that is what it did on my 99 intruige it also the outside temp ,but I am think that was just for the are info
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Old 04-15-2006, 09:15 AM   #5
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If I were doing a conversion from R-12 to R-134a, I'd replace the compressor and the receiver dryer, and while you have the system evacuated replace all of the seals in the AC system with brand new ones. Honestly, seals are NOT expensive, so just replace all of them while the system is discharged.

I had an AC shop convert my wife'* former 1988 Grand Prix from R-12 to R-134a, and insisted they put in all new seals. The converted R-134a system won't blow as cold as R-12, but it'* still cold enough unless you're trying to refrigerate your beer.
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Old 04-15-2006, 11:10 PM   #6
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I beleive you need a new orifice also when changing. Its also good to change the accumulator as welll as the other items mentioned.
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