15 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHUnexplained loss of coolant
Leading reported evidence
Fill cooling system and will work itself out over time
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
This is normal on an improperly filled cooling system and will work itself out over time.
Leading evidence: 'Fill cooling system and will work itself out over time' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check back of the 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.
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Performed · outcome unconfirmed · Original poster
No white smoke, no creamy colored oil on dipstick, tank and cap replaced by dealer 1 yr ago.
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Performed · outcome unconfirmed
Dealership checked everything and replaced the cap.
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Discussions that contain suggestions
1
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Suggestion
Usually when you fill the expansion tank to the full line and then get the car hot, some of the water will come out and kind of find it's operating level.
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.
15 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: 20261026T130754Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
'01 996 with 96k. I had the coolant tank topped off 2 weeks ago and today I noticed it was under the min. level again. No leaks anywhere that I can tell and the car runs perfect. Coolant tank replaced by P. dealer 1 year ago. Any cues as to what's going on? Thanks
If you haven't driven the car much since the coolant tank was replaced, you could just be getting low because there is air in the system that is slowly bleeding out. This is normal on an improperly filled cooling system and will work itself out over time. Keep an I on the level in the tank and fill as necessary untill the level becomes stable.
No white smoke, no creamy colored oil on dipstick, tank and cap replaced by dealer 1 yr ago. Dealer topped of 2 weeks ago during 90k check-up with no issues. Just low again
also check the back of the tank. If it is gone again, typically it leaks where you cannot see it. Mine was cracked and until it was removed, it was impossible to see
Wouldn't there be a noticeable leak on the floor. That's how I noticed the original tank was cracked 1 yr. ago. Now, there's no puddle or wetness anywhere. cap seems secure
+1 on the cap.
I didn't do enough research before I took it into the dealership. Same signs as you, couldn't see a leak anywhere, but level kept dropping. Dealership checked everything and replaced the cap.
Usually when you fill the expansion tank to the full line and then get the car hot, some of the water will come out and kind of find it's operating level. I don't usually see it go below the min. line but more often than not I find that they level out closer to the min. than the max. It is a good idea to change or at least check the cap anyway, but you may find that this is just how it is. Unless of course you continue to lose water but you didn't mention puddles.
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