Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that report a fix
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported fix
I used a 10mm 1/4" drive swivel socket on a long extension to remove the retaining bolt. The tougher part was disconnecting the valve from the plastic piping without damaging anything, but by squeezing the large outer ring and slowly working the valve off it did the trick.
AOS to crankcase breather vent valve? Replace or - and which hose is this?
Read full discussion summary
Leading evidence: 'Combined work: Disconnect valve + Use 10mm 1/4" drive swivel socket' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, The most frequently discussed action is 'Combined work: Disconnect valve + Use 10mm 1/4" drive swivel socket' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Combined work: Disconnect valve + Use 10mm 1/4" drive swivel socket', supported by resolution reports in 1 discussions. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
The tougher part was disconnecting the valve from the plastic piping without damaging anything, but by squeezing the large outer ring and slowly working the valve off it did the trick.
AOS to crankcase breather vent valve? Replace or - and which hose is this?
Use 10mm 1/4" drive swivel socket
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
I used a 10mm 1/4" drive swivel socket on a long extension to remove the retaining bolt.
AOS to crankcase breather vent valve? Replace or - and which hose is this?
Replace took place
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Yep, Engine # 663 09951 is where that change took place .......
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported fix
I used a 10mm 1/4" drive swivel socket on a long extension to remove the retaining bolt. The tougher part was disconnecting the valve from the plastic piping without damaging anything, but by squeezing the large outer ring and slowly working the valve off it did the trick.
AOS to crankcase breather vent valve? Replace or - and which hose is this?
Disconnect valve
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
The tougher part was disconnecting the valve from the plastic piping without damaging anything, but by squeezing the large outer ring and slowly working the valve off it did the trick.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported fix
I used a 10mm 1/4" drive swivel socket on a long extension to remove the retaining bolt. The tougher part was disconnecting the valve from the plastic piping without damaging anything, but by squeezing the large outer ring and slowly working the valve off it did the trick.
AOS to crankcase breather vent valve? Replace or - and which hose is this?
Coverage and how to read this overview
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T112012Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Ok, this relates to that another thread but decided to start a new one because this is more about that valve itself.
Two questions - is that valve recoverable or should I just get a new one. If that is the case how that is removable - what kind of connection is the bottom one - is it possible to just rotate and lift that?
Another question - what is that long vertical hose that goes next to that valve - how to remove that - I'm not familiar with that connection. If I could remove that it would give a lot more room to try to remove that valve. That's quite a tight spot as you can see from that generic image.
Yes - I actually already found out that one (learning curve here). Looks like it is better idea to remove that vent valve without removing that power steering line because it's a too much of a work.
I just removed this valve on my car yesterday to replace the leaking o-ring...there is a bolt you cannot see behind the valve holding it down. I did unbolt the harness bracket in front of it but did not need to remove any hoses. I used a 10mm 1/4" drive swivel socket on a long extension to remove the retaining bolt. The tougher part was disconnecting the valve from the plastic piping without damaging anything, but by squeezing the large outer ring and slowly working the valve off it did the trick.
Ah, good to know - thanks. I haven't received that valve yet - looks like it's going to be some fun for the weekend. So I'll need to take a closer look at the whole thing because based on that front view it appears as if you could just lift the valve. Just wondering what kind of bracket is there. I'll need to clean that area properly and i'll try to take some pics just in case it might help someone who needs to replace that as well.
I wonder how many of those who have had AOS issues haven't noticed this. At least it appears as if this relates to AOS issue.... or? Mine was broken so I would assume that this relates to that somehow.
There isn't a bracket holding the valve down, just a bolt through a flange molded in the valve body. Once the bolt is removed you can lift the valve out of the case. BTW, these are very simple valves, it just has a on-way check valve inside. Unless the spring inside is broken or the plastic housing is damaged they are reusable. Is there something specifically wrong with yours?
So I have a 2002 C4S 3.6 and per AutoAtlanta parts diagram I should have this (99610714755) crankcase breather hose for "2002-2005" 3.6L... I however have this one (99610714759) which is for "1998-20013" 3.4L... Very weird situation here, maybe my car was an early 2002?
