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Author
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Topic: r12 on the ac compressor
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mikel3891
Gearhead Posts: 111
From: philippines
Registered: Sep 2005
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posted 04-25-2006 10:56 PM
 
I want to switch to an r134 setup on my 68 mustang, all parts are r134 compatible except for the compressor which is used and has r12 in it. Can I just flush the r12 and put r134 on the system or I should rebuild or replace the compressor to r134 useable?
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'68Coupe
Journeyman Posts: 40
From: Los Angeles, CA, USA
Registered: Apr 2006
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posted 04-25-2006 11:29 PM
ive always been told that you need a 134-specific compressor. the old r12 units wont work for the newer 134.its also generally recommended that you replace the stock condensor, unless its in perfect condition. sorry to burst your bubble, but for these reasons, a/c conversions are usually pretty pricey. ------------------
- 1968 coupe, vinyl top
- 289ci
- Hooker full length headers
- Factory A/C
- Edelbrock 1403 carb
- Edelbrock intake
- Griffin radiator (stock replacement)
- Ignitor II
- Koni classics front and rear [This message has been edited by '68Coupe (edited 04-25-2006).]
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mikel3891
Gearhead Posts: 111
From: philippines
Registered: Sep 2005
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posted 04-25-2006 11:46 PM
Can you just rebuild the compressor or you should replace it with an r134 compatible compressor?
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my6T65.0
Journeyman Posts: 26
From: Ohio, USA
Registered: Apr 2006
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posted 04-26-2006 03:49 PM
After the charge has been blown, I'd run AC system flush through it to get out the old oil (it's the real issue, R12 and R134a use entirely different oil with different properties). You DO NOT have to replace the compressor! The drier should be replaced when the charge is blown, and I'd replace the AC core with one of the larger new design units made for R134a conversions by CAA. The larger core will compensate for the innefficency of R134a, and your AC will be nice and cold.  I'd give a little better description, but luckily, all the AC work I've done lately has been charging R134a systems. (foggy memory  )
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83j20
Gearhead Posts: 304
From:
Registered: Jul 2002
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posted 04-26-2006 05:55 PM
So, 134a affects short-term memory?
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my6T65.0
Journeyman Posts: 26
From: Ohio, USA
Registered: Apr 2006
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posted 04-26-2006 10:25 PM
quote:
Originally posted by 83j20:
So, 134a affects short-term memory?
Only if I punch a hole in it and stick the tube up my nose
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mikel3891
Gearhead Posts: 111
From: philippines
Registered: Sep 2005
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posted 04-27-2006 06:00 AM
All my parts, including the drier, are new and compatible with r134. Only the compressor is old and has old r12 oil in it. So I think I'll just flush the old oil out and put r134 on the whole system.
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