Converting AC from R12 - Page 2 - 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 07-03-2003, 02:43 AM   #11
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Is that the low or high side reading? Did you read it when everything was running?
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Old 07-03-2003, 02:51 AM   #12
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it was the side where u put the r-134 in it wasnt running
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Old 07-03-2003, 02:51 PM   #13
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Follow the guidelines above to get good pressure readings. When the system is at rest, the only thing that can be measured is the purity of the refrigerant.
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Old 07-03-2003, 06:17 PM   #14
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A/C systems are very touchy and can be influenced by many little things, and you increase the amount of variables when you retrofit a system.

I did the same thing on my 89 Bonneville 5 years ago before I knew much about retrofits and a/c. I had a leak on the low side schrader valve also. I took out the valve stem and screwed an R-134a valve with valve core on top of where the old valve was. I used the cycling time of the compressor to get a feel for whether or not the system was full. It was still running great when I sold it in 2000.

Looking back, I skipped a bunch of steps like checking the high side, vent temps, cooling the condensor, vacuuming, replacement of the accumulator, etc. I feel lucky that I got it right!

Ester oil is important in R-134a retrofits. The existing mineral oil in the system will either all leak out or sit in low points in the system. It won't move around with the new R-134a. The Ester will.

You and I were fortunate, but I have heard more horror stories than successes with do-it-yourself retrofits.
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Old 07-03-2003, 06:24 PM   #15
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heres what i did today:

i sat in my car, and took the a/c switch and went from off on off on off on off on, and after awhile, the compressor kicked on, and cold air started coming out. after a minute or less, it kicked off, and never went back on.. what the!!!!

Rob

help?
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Old 07-03-2003, 07:04 PM   #16
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It'* hard to say without a good diagnostic. May be the A/C clutch, low on freon, pressure cycling switch, relay, etc... May be time for a visit to a good A/C shop.
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