12 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHcoolant leak, but where from?
Reported or suspected cause
cause
Suggestion or failed attempt
No successful repair reported for this finding.
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1
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Read evidence and context
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Suspected cause
On the second occasion I absolutely refused to think it was the cause but again it was proved to be so despite replacement 3 years previously.
Leading evidence: 'cause' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'cause' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Run from the header tank' (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
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suspected cause
On the second occasion I absolutely refused to think it was the cause but again it was proved to be so despite replacement 3 years previously.
Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.
Run from the header tank
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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.
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Suggestion · Original poster
Header tank is on far left, the dripping is more left of centre and there is no signs of it running from the header tank to where the drip is.
Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.
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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.
12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
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0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T044418Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all you more experienced than me 996 owners...
My '00 996 C2 Cab has today formed a coolant leak. I've had a look under the engine and it appears to be at the rear of the engine on the left hand side (looking forward). The drips (circled in the photo) appear to be at the bottom of the belt, however I'm not sure where they are actually emanating from. The obscured view from the top doesn't make it any easier to spot. Any thoughts? I'm hoping it is just a clip somewhere or a perished hose.
Thanks in advance
Martin
Thanks Dave
Header tank is on far left, the dripping is more left of centre and there is no signs of it running from the header tank to where the drip is.
Any other thoughts?
Cheers
Martin
Have had two episodes with header tank leaking in 6 years - on both occasions it was not immediately obvious as the leak was quite small at first even when quite hot and well-pressurised. On each occasion the coolant dripped to the floor in a place that did not make the cause obvious.
On the second occasion I absolutely refused to think it was the cause but again it was proved to be so despite replacement 3 years previously.
It's not to say you may have something different but problems with caps and tanks have been well documented and appear to be the cause of the vast majority of coolant leaks at the rear, but I guess you will check all your hoses and clips especially as they may well all be 10+ years old now.
Dave J
Agree,
a pin prick can develop and when up to pressure will project spray which at times cannot be seen. This can then run down the engine bay in any number of places,
Split expansion tank is best bet,
good luck.
Difficult to tell from that photo. I would second the header tank, but could it be from the thermostat housing, or (worse) water pump seals? A better photo would help.
Thanks all, some useful pointers for me to investigate.
Richard, when you indicate better photo, do you mean better resolution / larger size, or taken from a different angle?
Thanks again, Martin
Better photo attached. When warm, the water was dripping from the bottom of the belt (circled). There is still a drip there this morning.
Cheers
Martin
The water pump is directly behind that pulley, with the inlet pipe at the bottom. If I were you, I would take off the polyrib belt and wiggle the pulley to see if the water pump bearings have gone. If you take off the air filter housing you might also be able to see a bit more from above.
Thanks Richard. You may be onto something with that as there is certainly no visible evidence of the water dripping from higher up the engine.
Cheers, Martin
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