5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCoolant leak
Reported or suspected cause
hairline crack in the header tank
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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Discussions that report identifying a cause
1
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Reported cause
I had the same on mine, it turned out to be a hairline crack in the header tank.
Leading evidence: 'hairline crack in the header tank' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'hairline crack in the header tank' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace rads, just food' (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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Run hand around the plastic header tank and this appears
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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 performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
My 2000 C4 appears to have a coolant leak which drips from behind the nearside silencer,this only occurs after really driving hard and doesn't usually happen during normal runs.I have run my hand around the plastic header tank and this appears to be dry,are there any other leak points in that area?
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.
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Suggestion
I hope it's you don't have to replace the rads, just food for thought Gazzy.
Run hand around the plastic header tank and this appears
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 · Original poster
My 2000 C4 appears to have a coolant leak which drips from behind the nearside silencer,this only occurs after really driving hard and doesn't usually happen during normal runs.I have run my hand around the plastic header tank and this appears to be dry,are there any other leak points in that area?
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.
5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 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: 20261026T220748Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Can anyone offer any advice? My 2000 C4 appears to have a coolant leak which drips from behind the nearside silencer,this only occurs after really driving hard and doesn't usually happen during normal runs.I have run my hand around the plastic header tank and this appears to be dry,are there any other leak points in that area? I've tried looking but everything is so packed in I can't see the source.
Is there steam coming form the front of the car after a run? Sometimes the radiators perish at the front where leaves get in and rot and corrode the rads. This happened mine. There was no leak in the header tank and the cap on the coolant tank was also fine. I just got the warning light on the dash. I hope it's you don't have to replace the rads, just food for thought Gazzy. HTH. Baz.
I had the same on mine, it turned out to be a hairline crack in the header tank. Its a know issue that the plastic gets brittle as it goes through many heat cycles and it sits over the exhaust. When the coolant system is warm and under pressure it opens the hairline crack up, however when cold there is no leak.
As David says, it might well be a hairline crack or pinhole in the tank. They seem to do this on the back face, which makes it impossible to see. However, if it is dripping from the drain tube, it might be that the tank cap is leaking (common problem). This then collects in the tray on the top of the tank, and drains down the tube.
Thanks for the replies,I haven't noticed any steam from the front and they looked ok when I cleaned them but I will keep an eye on it.I take the point about the header tank sealing as it cools down,by the time I've managed to run my hand round it it has cooled a bit.I'll probably start with the cap and then change the tank,looks like an a**e of a job,anyone done it?Again thanks for the replies,always nice to know if somebody else has had the same problem.
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