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Best AC O-rings for R-12? #5448738 06/08/20 12:06 AM
Joined: Dec 2002
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JHZR2 Offline OP
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I bought my 300cd a decade or so ago, and I knew it had some history of AC leaks. I have all the receipts for the life of the car.

But it was still R-12 and it blew cold when I bought it, and any leakage was slow enough that for the three or so years that I used it before kids, I never added any. Then the car sat for ~6 years. And there was no pressure at all in the hoses.

I’ve been slowly getting the car back going again, doing some updates that I had meant to do, and others that have popped up. It was nice and cool until recently - now heat is here. So I wanted to troubleshoot. I don’t have bone dry nitrogen or R-22 for troubleshooting, but I could get some ES-12a for off road troubleshooting. I also got dye. So I installed this, and have run it a few hours. That stuff really does work well btw.

I wanted to pull my blower to lube the bushings, and to see if there was any sign of leakage via I’ve or my bc sniffer. I had been unsuccessful seeing any leaks, even at the R-4 compressor clutch and ports. But when I pulled the kick panel, I saw this:

[Linked Image from i.imgur.com]

And this!

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]

After I pulled the blower, I saw this:

[Linked Image from i.imgur.com]

I’m guessing it’s just a bad o-ring, and the leaking refrigerant takes oil with it. Nothing under the kick panel is particularly oily. The noise insulation has some on it, but it isn’t sopping wet or something. I guess the time without r-12 and oil on the seal caused it to dry and crack.

So what is the best O-ring type and manufacturer for R-12? Ultimately I intend to go back to using that, once any leaks are found and fixed. And it seems best to start with this one...

Re: Best AC O-rings for R-12? [Re: JHZR2] #5448742 06/08/20 12:22 AM
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chemman Offline
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I have read that the HNBR are the best o-rings for HVAC work. If it were me, I would go with 4-Seasons o-rings. Also, I would recommend getting some Nylog Red (RT-200R) o-ring/gasket sealant and using it to lubricate the o-rings prior to installation. That stuff is great!!

Here is a link:
https://www.amazon.com/Refrigeratio...ords=nylog&qid=1591593302&sr=8-3

Good luck!


92 Olds 88 Hav 5w30 PL/L24011
99 Buick Century Hav 5w30 PL/L24011
99 Silverado 5.3L Hav 5w30 PL/L25288
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Re: Best AC O-rings for R-12? [Re: JHZR2] #5448768 06/08/20 04:11 AM
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demarpaint Offline
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Subscribed. I have an R-12 system O-ring project to tackle later this week, hopefully. Thankfully I have R-12 on hand.


God Bless Our Troops

Re: Best AC O-rings for R-12? [Re: chemman] #5448773 06/08/20 04:42 AM
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WyrTwister Offline
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Originally Posted by chemman
I have read that the HNBR are the best o-rings for HVAC work. If it were me, I would go with 4-Seasons o-rings. Also, I would recommend getting some Nylog Red (RT-200R) o-ring/gasket sealant and using it to lubricate the o-rings prior to installation. That stuff is great!!

Here is a link:
https://www.amazon.com/Refrigeratio...ords=nylog&qid=1591593302&sr=8-3

Good luck!

Yes


Wyr
God bless
Re: Best AC O-rings for R-12? [Re: JHZR2] #5448789 06/08/20 05:37 AM
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Lubener Offline
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About 15 years ago my 87 Ford R12 system went empty over the winter. Leaks usually leave an oily residue. I had a few. I bought the tool to disassemble the spring lock couplings, disassembled and replaced ALL o rings at every joint in the system. There were two o rings at every coupling. I went to the dealer for the o rings, they had an assortment pack. I lubed each new o ring with refridgerant oil. I evacuated and recharged the system with R12 and it still works perfectly to this day.

Last edited by Lubener; 06/08/20 05:39 AM.

The "thinking" man's friend.
Re: Best AC O-rings for R-12? [Re: JHZR2] #5448852 06/08/20 07:35 AM
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mk378 Offline
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That looks like it is running down from above, likely the core is leaking.

The most common place for o-ring leaks is the line from the compressor to the condenser, because there the refrigerant gas is hot. The heat hardens the o-rings and then they leak. Always pre-emptively replace those o-rings when you have an old system empty. You don't have to replace every one in the system.

Re: Best AC O-rings for R-12? [Re: JHZR2] #5448867 06/08/20 07:52 AM
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Chris142 Offline
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The green ones that are common now work well for R12. One of my customers goes by "rollguy" on the MB forums. He sells a kit to put a Sanden on there as well as condenser upgrades.


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87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
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Re: Best AC O-rings for R-12? [Re: Lubener] #5448870 06/08/20 07:54 AM
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Chris142 Offline
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Originally Posted by Lubener
About 15 years ago my 87 Ford R12 system went empty over the winter. Leaks usually leave an oily residue. I had a few. I bought the tool to disassemble the spring lock couplings, disassembled and replaced ALL o rings at every joint in the system. There were two o rings at every coupling. I went to the dealer for the o rings, they had an assortment pack. I lubed each new o ring with refridgerant oil. I evacuated and recharged the system with R12 and it still works perfectly to this day.

Your FS6 compressor does not leak? Amazing!


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Best AC O-rings for R-12? [Re: Chris142] #5449750 06/09/20 01:36 PM
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JHZR2 Offline OP
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Originally Posted by Chris142
The green ones that are common now work well for R12. One of my customers goes by "rollguy" on the MB forums. He sells a kit to put a Sanden on there as well as condenser upgrades.


Yes very well acquainted with Rollguy over on peachparts. I may go the sanden route when these R4s quit.

For now I just need to figure out what exactly is leaking.

Almost looks like its coming out the side. Curious if that is possible... the expansion valve looks like this:

[Linked Image]

Some better pics are here:

https://dieselgiant.com/repairyourac.htm

Mine:

[Linked Image from i.imgur.com]

I think perhaps it is the top or bottom right line? Apparently the upper lines are the evaporator in and out lines. The lower right line is the high pressure liquid line going to the expansion valve then to the evaporator. The lower left large line is the vapor or low pressure line going back to the compressor.

Re: Best AC O-rings for R-12? [Re: Chris142] #5449784 06/09/20 02:56 PM
Joined: Jan 2011
Posts: 4,116
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Lubener Offline
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Joined: Jan 2011
Posts: 4,116
Originally Posted by Chris142
Originally Posted by Lubener
About 15 years ago my 87 Ford R12 system went empty over the winter. Leaks usually leave an oily residue. I had a few. I bought the tool to disassemble the spring lock couplings, disassembled and replaced ALL o rings at every joint in the system. There were two o rings at every coupling. I went to the dealer for the o rings, they had an assortment pack. I lubed each new o ring with refridgerant oil. I evacuated and recharged the system with R12 and it still works perfectly to this day.

Your FS6 compressor does not leak? Amazing!

No, it was a HR980 compressor.

Last edited by Lubener; 06/09/20 02:56 PM.

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