9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHAnybody know what's leaking here?
Reported or suspected cause
cracked coolant resi or the cap is leaking
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
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 suspect a cause
1
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Suspected cause
Most likely a cracked coolant resi or the cap is leaking
Leading evidence: 'cracked coolant resi or the cap is leaking' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'cracked coolant resi or the cap is leaking' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace cap' (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.
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 suspect a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suspected cause
If you said it was more towards the front inside of the drivers wheel, it was the oil separator for me.
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
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Suggestion
Like other said, start with replacing the cap with the new OEM version.
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
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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
For me, it started off like this, but then it got worse and had to replace the coolant expansion tank.
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.
9 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
'03 C4S - This is behind the driver's side rear wheel - looks to be water/coolant? Couldn't get further in there to see if it was coming from higher but didn't see anything leaking from around the coolant reservoir or around the top of the engine.
https://imgur.com/a/S0ooBG4
Thanks for any help!
What color is the liquid? Seems like it could be the coolant that is seeping from somewhere. It's hard to see but perhaps the oil cooler? I'm guessing that coolant runs through it. Maybe someone else can chime in.
Probably tank. They crack in the back almost impossible to see. However, look closely around the tank neck beneath the cap for signs of coolant. Make sure you have the most recent cap, has 04 on the top, and it is on TIGHT!
If you said it was more towards the front inside of the drivers wheel, it was the oil separator for me. It’s more than 5 hours to get in there to inspect and replace. (My 03 c4 last week)
Did you just finish a drive? Could be nothing. The overflow hose for the coolant expansion tank discharges into that area. Check that you have the latest version of the cap (ending in "04" and that it's on tight. If this is a frequent occurrence, then it could be a cracked coolant tank.
Yeah, this was just after a drive. Fairly sure I have the older version of the cap, but didn't see anything leaking around it. Will look into it. Thanks!
Like other said, start with replacing the cap with the new OEM version. Make sure you get the Porsche geniune part.
For me, it started off like this, but then it got worse and had to replace the coolant expansion tank. If your tank is the culprit, then again, don't under any circumstances purchase an aftermarket version. Go with the Porsche Geniune part.
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