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Replace with green o-rings for r134a?
I know you need to replac the o-rings with the green ones for r134a.
Where are all these o-rings? I found two on the rear condenser. I'm guessing another two on the front condenser? Evaporator, receiver/drier? Any other places?
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Howard 2003 996tt 1997 911 Coupe Artic Silver (sold) 1988 Black 911 Coupe (gone but not forgetten) |
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09-13-2005, 04:28 PM
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On 1984-1989 911's and 930's (including 83 930's) there is an o-ring at every refrigerant component connection in the a/c system:
Compressor ports; suction side is a #10 size, discharge side is a #8. Decklid condenser, two #8 Front condenser, two #6 Drier, two #6 Expansion valve inlet, one #6 Evaporator outlet, one #10 Lightly lubricate the o-rings with refrigerant oil before you finalize the connection. Do not overtighten the connection nut. You should be adding approximately 6 ounces of refrigerant oil to the system when you convert over to the new refrigerant. Regardless of what you may "read", you can use ester and you don't "have to" flush the system unless you have signs of contamination. Don't forget to replace your receiver drier. |
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09-13-2005, 04:55 PM
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Thank you for the much needed information.
My system is already r134, but my rear condenser developed a leak. When I installed the new condenser I noticed it still had the black o-rings. The P.O. had the conversion done at Dougherty's in PA.
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Howard 2003 996tt 1997 911 Coupe Artic Silver (sold) 1988 Black 911 Coupe (gone but not forgetten) |
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09-13-2005, 05:51 PM
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Dougherty's in PA. is a good shop.
The most common o-ring material for R134a is HNBR, which Highly Saturated Nitrile Rubber or hydrogenated NBR. R134a o-rings compatible o-rings are not always "green" in color. There are blue and black o-rings, however "green" is the most common.
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Kuehl 1987 911 cab, modified https://griffiths.com/ |
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09-14-2005, 06:28 AM
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Quote:
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Howard 2003 996tt 1997 911 Coupe Artic Silver (sold) 1988 Black 911 Coupe (gone but not forgetten) |
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09-17-2005, 01:17 PM
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Join Date: Jun 1999
Location: SJ
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Lick it, if it is salty it has lots of saturated greases,if it is kind of sour then you have lots of hydrogenated greases. Sorry I couldn't resist! Just Kidding! Replace them if you are in doubt!!
cheers,Antonio. |
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09-17-2005, 06:33 PM
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Antonio's idea sounds pretty good, however you could check the LDL level and if it's over 160 then watch the fat.
The most common color for HNBR ac oring is "green".
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Kuehl 1987 911 cab, modified https://griffiths.com/ |
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09-18-2005, 04:07 PM
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