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What happened to my O-Ring?

Rick-l on Sat May 29, 2010 9:37 PM User is offline

Year: 2003
Make: Subaru
Model: WRX

I lost all my r-134 over the winter. I pressurized it to look for leaks and it shoots out the high side junction at the compressor. On subaru the fittings are an O-ring in a slot on the tube that goes into a hole and is held in place with a bolt. The o-ring was square and hard.

Anyone work on these? Should I replace all the o-rings? I count 7, 2 at the expansion valve, 1 at the pressure switch, 2 on the compressor and 2 on the condenser. There may be another 2 on the evaporator but they look hard to get to. Can you buy a kit? Also I don't see a receiver dryer.

Edited: Sun May 30, 2010 at 1:31 PM by Rick-l

Rick-l on Sun May 30, 2010 1:31 PM User is offline

Is this the lube you use to assemble o-ring joints?
nylog RT201B - Nylog (Blue) Gasket Thread Sealant for HFC Systems

I assume this will have all the o-rings I need.
o-rings CP3008 - 1986 - 2005 Asian Import System O-ring Kit

bohica2xo on Sun May 30, 2010 2:15 PM User is offline

What happened to your O ring may (or may not) be happening to the rest of the O rings in the system. Only one way to know for sure.

Out a batch of a million or so O rings, a small percentage of them will have defects. Perhaps the rubber did not cure right on that one part. Or they shipped Subaru a batch of the wrong elastomer. Or someone contaminated that particular seal with something it was not compatible with - we had a real issue with the hand lotion one assembly line worker used once... You get the picture.

Check the adjacent seals. If they look & feel fine, then it was a defect. If they are hard as a rock, better look at all of the O rings.

Nylog is wonderful stuff. It helps lubricate the seals, and keeps them from developing fretting wear. Use it sparingly, but cover the seal surface.

That seal kit may (should) have the few seals you need. If you are not sure, call AMA on tuesday morning & double check.


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

Rick-l on Tue June 01, 2010 11:31 AM User is offline

am i correct there is no receiver drier? ACKits lists one.

HVargas on Tue June 01, 2010 3:22 PM User is offlineView users profile

Yes there is a R/D. It is attached to the condenser. Most new condensers will come with this part already attached to it. The square o-ring problem is very common. The 2 most recent one's I have done, have both had leaks at the compressor where the discharge line connects. Pull the line and the o-rings have hardened and are squared off. Please them with new o-rings and some nylog and you will be set. Thanks for the order!


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