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Porsche Club GB

coolant leak

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Original source
3 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
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 report identifying a cause
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 cause

It turned out to be a Hairline crack in the header tank.

Original post Read captured discussion
coolant leak
Frequently discussed work

Check cap first as they commonly give up

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

Check the cap first as they commonly give up.

Original post Read captured discussion
coolant leak
Read full discussion summary

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 'Check cap first as they commonly give up' (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.

Read captured replies

1 matching discussions · 3 captured posts examined · 0 partial discussions

Compare 3 other evidence results

Check cap first as they commonly give up

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

Check the cap first as they commonly give up.

Original post Read captured discussion
coolant leak

Check header tank

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

You can always check the header tank, run the engine until the coolant starts leaking out, then look at the header tank, if the tank is not full its unlikely to be leaking from the overflow.

Original post Read captured discussion
coolant leak

Run engine until the coolant starts leaking out

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

You can always check the header tank, run the engine until the coolant starts leaking out, then look at the header tank, if the tank is not full its unlikely to be leaking from the overflow.

Original post Read captured discussion
coolant leak
Frequently discussed actions (3)

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

Check cap first as they commonly give up

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

Check the cap first as they commonly give up.

Original post Read captured discussion
coolant leak

Check header tank

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

You can always check the header tank, run the engine until the coolant starts leaking out, then look at the header tank, if the tank is not full its unlikely to be leaking from the overflow.

Original post Read captured discussion
coolant leak

Run engine until the coolant starts leaking out

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

You can always check the header tank, run the engine until the coolant starts leaking out, then look at the header tank, if the tank is not full its unlikely to be leaking from the overflow.

Original post Read captured discussion
coolant leak
Reported and suspected causes (1)

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

hairline crack in the header tank

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
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 cause

It turned out to be a Hairline crack in the header tank.

Original post Read captured discussion
coolant leak
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.

3 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: 20261026T150451Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

my coolant keeps leaking through an overflow pipe over the exhaust pipe i cant think of a reason why. it keeps doing this when the car is hot a friend told me to bleed the system but im not sure. Has anyone encountered this problem before?

POST 2Original post

I had the same problem, only leaking when warm. It turned out to be a Hairline crack in the header tank. I was told that this was quite a common occurrence on the 996. I was fortunate enough for it to go whilst Porsche GB had my car on display and so they consequently repaired it. The technician at OPC Silverstone said the tank was about £250.00, and that they would need to drop the left side of the engine to get it out. You can always check the header tank, run the engine until the coolant starts leaking out, then look at the header tank, if the tank is not full its unlikely to be leaking from the overflow. The heat and pressure causes the hail line crack to expand, so when its cold no leak.

POST 3Original post

Check the cap first as they commonly give up. It is on its 4th update. Pop the bonnet (or is it boot, I never know. Call it rear lid) when the leak occurs and have a look. If it is coming from the rear of the coolant tank then it could be cracked, another common problem. Not expensive to replace if your car is post 2001 as the tanks were half the price of pre-facelifts.

This is a source reference. Confirm exact model applicability in the original material.