14 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCoolant Leak
Leading reported evidence
Check first
Performed · outcome unconfirmed
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 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
The coolant reservoir cracking is very common - I'd have this checked first.
Leading evidence: 'Check first' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'hairline crack in the water reservior only found' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check first' (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 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
Had the coolant tank replaced by specialist and it has been fine since.
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
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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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
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.
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
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Performed · outcome unconfirmed · Original poster
My 996 (99 c4) has just used a litre of coolant in just one week.
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 water reservior only found
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect 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.
Suspected cause
had the same problem early january of this year- it turned out to be a hairline crack in the water reservior only found when a good friend in the trade put the tank under a presure rig which caused a very slight spry of coolant you could harly see.
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.
14 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 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: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi Everyone,
My 996 (99 c4) has just used a litre of coolant in just one week. There seem to be no traces on my drive way or around the coolant tank itself. There are no plumes of smoke from the exhaust either.
Any suggestions of where to look first?
Many Thanks in advance
Migration info. Legacy thread was 127860
How do you know it's used a litre of coolant? The system is pressurised causing the level to drop ie. you can fill it up to max but this will drop to min after a drive, Any excess coolant will be 'evacuated' from the car.
Migration info. Legacy thread was 127942
Hi
The level fell to below minimum and the coolant warning light came on. It took a litre to bring it up to max.
Migration info. Legacy thread was 128087
Hi Asim,
This happened to me a little while back with no visible trace of coolant on garage floor. Took it to the OPC and found a number of leakages in the cooling system. Parts replaced, coolant level stable again.
I would guess that you have leaky rads. A weak spot on the 996. You probably aren't seeing any coolant on the floor because it is under far less pressure when parked up. i.e. a weaping radiator becomes a leaking radiator when driving.
Migration info. Legacy thread was 128125
Jay T - would you suggest carrying a spare bottle of coolant around with you just in case? I do in the Golf.
~ Maxie
Migration info. Legacy thread was 128157
Hi.
My 996 did the same thing. Used to need coolant refill every 4k or so. Had the coolant tank replaced by specialist and it has been fine since. Although right after the refit there was an air bubble in the system which caused the level to drop again. Was rectified by garage however.
Pete
Migration info. Legacy thread was 128179
I did carry around a bottle of coolant for a while. But never really needed to use it ad-hoc. Just topped up periodically at home.
Migration info. Legacy thread was 128215
had the same problem early january of this year- it turned out to be a hairline crack in the water reservior only found when a good friend in the trade put the tank under a presure rig which caused a very slight spry of coolant you could harly see. replaced tank-job done- cost £180-00 in total. opc wanted to change rads....didnt ask how much
.
Migration info. Legacy thread was 128380
Old forum user Unidentified(11139) wrote:
if your rads are leaking they will spray the inside of the bumper when your driving as they will be under pressure, so go for a spin, stop, and have a look in your front air intakes for signs of moisture.
If there's none to be seen the other weak spot is the reservoir.
Migration info. Legacy thread was 129386
