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#4710740 - 03/29/18 05:21 PM A/C question
007 Offline


Registered: 06/19/14
Posts: 397
Loc: Clermont, Fl
I recently had my A/C in my 1986 Buick T Type converted to R134 from R12.. Before the swap I was running cool but not cold. After the swap I was told I may be leaking from my compressor as it showed signs of oil leakage. Long story short I now have NO cold air and a guage check indicates NO Freon in the system. Is this possible or have I been had? I was told I might need a new compressor but the sudden change is kind of dramatic.

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#4710764 - 03/29/18 05:56 PM Re: A/C question [Re: 007]
Billbert Offline


Registered: 10/09/09
Posts: 366
Loc: California
R134a has a much smaller molecular size than R12. Extremely small leaks with R12 can become much larger leaks when the system is converted to R134a. It just happens occasionally, with no great way to predict the outcome of the conversion.
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#4710775 - 03/29/18 06:11 PM Re: A/C question [Re: 007]
mk378 Offline


Registered: 09/27/15
Posts: 1449
Loc: USA
Leaky parts never get better with time.

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#4710782 - 03/29/18 06:19 PM Re: A/C question [Re: 007]
bdcardinal Offline


Registered: 06/03/05
Posts: 11078
Loc: Santa Barbara, CA
Whoever did the conversion really should have fixed any leaks, or at the very least given you a proper estimate, before giving the vehicle back to you.
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#4710789 - 03/29/18 06:26 PM Re: A/C question [Re: 007]
DBMaster Offline


Registered: 09/18/12
Posts: 5340
Loc: DFW
And, R134a usually runs at higher pressures than R-12. So, if you did have a leak - indicated by oily residue - the new refrigerant definitely would leak out faster than the R-12. I had an 89 Honda converted to Freeze 12 eight years ago. It's basically about 80% R134a with another gas blended in that is able to carry the mineral oil through the system. My output temperatures were about three degrees higher than with R-12 and A/C performance while the car was stopped was somewhat reduced. I'd rather stick with R-12 or HC refrigerants.

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#4710791 - 03/29/18 06:27 PM Re: A/C question [Re: 007]
Chris142 Online   content


Registered: 06/05/03
Posts: 16966
Loc: Deplorable in apple valley, ca
If it has that round R4 compressor they all leak.
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#4710829 - 03/29/18 07:19 PM Re: A/C question [Re: Chris142]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: Chris142
If it has that round R4 compressor they all leak.


Agreed.... one of GM's not-so-better ideas......
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#4710848 - 03/29/18 07:54 PM Re: A/C question [Re: 007]
007 Offline


Registered: 06/19/14
Posts: 397
Loc: Clermont, Fl
Would using Freon with stop leak work?

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#4710852 - 03/29/18 07:57 PM Re: A/C question [Re: 007]
rooflessVW Online   content


Registered: 12/24/11
Posts: 4328
Loc: North Carolina
Originally Posted By: 007
Would using Freon with stop leak work?

Yeah it'll clog everything up nicely.
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#4710872 - 03/29/18 08:18 PM Re: A/C question [Re: rooflessVW]
Chris142 Online   content


Registered: 06/05/03
Posts: 16966
Loc: Deplorable in apple valley, ca
Originally Posted By: rooflessVW
Originally Posted By: 007
Would using Freon with stop leak work?

Yeah it'll clog everything up nicely.
ya it will.dont put a rebuilt compressor on it either. New only.
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#4710927 - 03/29/18 09:06 PM Re: A/C question [Re: 007]
clinebarger Offline


Registered: 12/19/13
Posts: 1990
Loc: Fort Worth, Texas
134a conversion fittings can cause leaks all by themselves.....On a car like yours, I would restore the system & charge it with R-12.
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#4710943 - 03/29/18 09:17 PM Re: A/C question [Re: 007]
JHZR2 Offline



Registered: 12/14/02
Posts: 41896
Loc: New Jersey
How complete was the retrofit. A good job can work well, but if certain things are overlooked or not done, leaks and other issues can be prevalent.

R12 has dropped in price. You may have been much better off leaving it.

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#4711091 - 03/30/18 01:24 AM Re: A/C question [Re: 007]
Lolvoguy Offline


Registered: 02/06/14
Posts: 2393
Loc: Canada
I never knew r12 was still available. I thought it was phased out years ago
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#4711461 - 03/30/18 11:45 AM Re: A/C question [Re: Lolvoguy]
Chris142 Online   content


Registered: 06/05/03
Posts: 16966
Loc: Deplorable in apple valley, ca
Originally Posted By: Lolvoguy
I never knew r12 was still available. I thought it was phased out years ago
we still have 60 lbs of it. Is getting harder to find. I often buy it at yard sales.
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#4711701 - 03/30/18 04:27 PM Re: A/C question [Re: bdcardinal]
007 Offline


Registered: 06/19/14
Posts: 397
Loc: Clermont, Fl
Originally Posted By: bdcardinal
Whoever did the conversion really should have fixed any leaks, or at the very least given you a proper estimate, before giving the vehicle back to you.


I agree. Mechanic stated the system held vacuum for some time before they added 134 otherwise he would have not added any Freon with a leak. Car is going back Monday to see what the dye says. I also asked to be compensated for my $122 spent on hot air in the final repair to which he agreed. Will see what happens!

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