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Pooled up coolant

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1 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHPooled up coolant

Leading reported evidence

Replace air oil separator

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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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 · Original poster
As I was getting halfway into changing the AOS on my 03 C4S I noticed lots of coolant pooled up on top of the block under the drivers intake manifold near what I think is a knock sensor.
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Pooled up coolant

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Leading evidence: 'Replace air oil separator' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace air oil separator' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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1 matching discussions · 1 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace air oil separator

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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 · Original poster
As I was getting halfway into changing the AOS on my 03 C4S I noticed lots of coolant pooled up on top of the block under the drivers intake manifold near what I think is a knock sensor.
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Pooled up coolant

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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.

1 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: 20261026T033439Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

As I was getting halfway into changing the AOS on my 03 C4S I noticed lots of coolant pooled up on top of the block under the drivers intake manifold near what I think is a knock sensor. I cleaned up one puddle then took a picture. The reason for the AOS replacement was a broken nipple for the coolant line that runs off the passenger side of the AOS. Previous owner had it bypassed. Also found corroded wire coming of the starter and a broken wires to the changeover valve under there which should be the reason for a bad changeover valve code I'm getting. I guess my question is where do you think the coolant up there came from? Could it be from when the nipple broke and was bypassed but no one ever cleaned up under there? Would it evaporate over time ( I have no idea how long ago this bypass happened)? I still have a slow persistent coolant leak, I'm doing the water pump, thermostat, and lots of new coolant hoses as part of this job so who knows. Just curious if I should now be looking for a different source of the leak while I have this all apart. Also any other tips on getting the AOS bolt toward the rear of the car back in? Took forever to get it out...

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