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911buff
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964 A/C Conversion from R12 to R134
I need to convert my '91 C2 from R12 to R134...it is getting really hot here and I need to charge my A/C. The fittings on the compressor are easy, what I am unsure about is the Hi-Low pressure switch. No one has been able to definitively say that the switch must be replaced and if so, what it should be replaced with. Even the porsche dealer parts guy had no clue. Any help is greatly appreciated!
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06-18-2010, 12:25 PM
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Metal Guru
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Do a search over in the Rennlist 964 forum on this. I've never heard it mentioned.
You will need a new receiver dryer in addition to the fittings.
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Paul B. '91 964 3.3 Turbo Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, H&R Coilovers, ESB spring plates- 210 lb |
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06-19-2010, 04:14 AM
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Registered
Join Date: Jul 2004
Location: Tampa, Fl
Posts: 47
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Why dont you recharce with R12. Just had mine recharged last Saturday with R12 and its blowing ice cubes now.. :-)
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06-22-2010, 07:18 PM
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911buff
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The R12 recharge sounds great but I can't find anyone to do it. And I haven't seen anywhere to purchace. Can you point me in the right direction? Thanks!
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06-23-2010, 06:56 AM
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Metal Guru
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A charge with R-134a will work equally well if done right. All 964s are designed for and capable of using R-134a.
R-134a can remove more heat than R-12. It must run at a higher pressure which makes it unsuitable for older a/c systems that don't use barrier hose.
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Paul B. '91 964 3.3 Turbo Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, H&R Coilovers, ESB spring plates- 210 lb Last edited by 911nut; 06-25-2010 at 07:17 AM.. |
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06-24-2010, 12:35 PM
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Registered
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You don't have to replace the pressure switch function, stock works fine.
 
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07-07-2010, 02:17 AM
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Registered
Join Date: Dec 2004
Location: san jose
Posts: 4,982
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When I did mine, I put in the newer dryer, which requires different hoses. I replaced all the o-rings, added oil , and recharged. Works fine.
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steve old rocket inguneer |
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07-07-2010, 08:08 AM
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Registered
Join Date: Oct 2002
Location: Northern California
Posts: 786
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If you get the dryer from Griffiths you do not need to change lines. They actually sell an upgrade kit with fittings and oil for the conversion. Here is the link - they have a good question and answer page that explains the conversion process and advantages.
Porsche, 964, 993, C2, C4, Air Conditioning |
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07-07-2010, 07:47 PM
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911buff
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Thanks, great info! I will be taking care of the conversion soon, will post how it goes.
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07-09-2010, 04:12 AM
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911buff
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Finally got it taken care of. Turns out it was the Schrader valve on the low side port that was leaking. Through some pain in procuring the right adapters, it is blowing as cold as ever. Thanks for the advice!
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07-15-2010, 01:31 PM
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911buff
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Oh, I guess it is not over. As Lee Corso would put it, "not so fast." I apparently have a another leak. I turned on the A/C the next day and it was not very cold, although the compressor did Kick on. The day after that the compressor would not kick on at all. So, now I have to start over and search for the other leak somewhere else in the system...yeah me!
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07-17-2010, 08:14 PM
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Registered
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Usual suspects are: evaporator, compressor and condenser
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07-18-2010, 05:41 AM
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Architecture & Porsche's
Join Date: Jan 2006
Location: Austin, Texas
Posts: 3,189
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anyone have a conversion chart for R-134 from R12 on both 964 & 965 cars??
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Porsche Club Racing National Scrutineer '89 Andial 951 '82 928R '74 911 RSR 3.6 |
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07-19-2010, 06:55 AM
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Metal Guru
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Quote:
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Paul B. '91 964 3.3 Turbo Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, H&R Coilovers, ESB spring plates- 210 lb |
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07-19-2010, 10:16 AM
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Architecture & Porsche's
Join Date: Jan 2006
Location: Austin, Texas
Posts: 3,189
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i meant freon levels. I think I read 660 grams or so at one place. I recently had mine topped off by it barely budged the output: cools to about 75d on a hot day at best...I think the amount is shy of what it should be.
M.
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Porsche Club Racing National Scrutineer '89 Andial 951 '82 928R '74 911 RSR 3.6 |
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07-19-2010, 11:53 AM
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Metal Guru
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Quote:
R-12 930 g R-134a 840 g
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Paul B. '91 964 3.3 Turbo Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, H&R Coilovers, ESB spring plates- 210 lb |
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07-19-2010, 12:16 PM
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Architecture & Porsche's
Join Date: Jan 2006
Location: Austin, Texas
Posts: 3,189
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ah, that could explain things...:/
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Porsche Club Racing National Scrutineer '89 Andial 951 '82 928R '74 911 RSR 3.6 |
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07-19-2010, 12:17 PM
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1971 Porsche 911T
1974 Porsche 914-4 2.0
1991 Porsche 964 Turbo
