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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHDumping coolant follow up - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Replace reservior
Suggestion or failed attempt
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 contain suggestions
1
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Suggestion
y changing the reservior, it had a small leak and was a common issue in the boxster.
Dumping coolant follow up - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary
Leading evidence: 'Replace reservior' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace reservior' (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 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 · Original poster
Drove around locally to bring up to temp., 1/8" over the 180 mark which has been my running temp for the last three years, and experienced no overheating or coolant dump.
Dumping coolant follow up - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run with the #.01 cap
Suggestion or failed attempt
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 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
I know this has been discussed, but I'm still running with the #.01 cap.
Dumping coolant follow up - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test cap and seal
Suggestion or failed attempt
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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.
Dumping coolant follow up - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test done
Suggestion or failed attempt
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 contain suggestions
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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 · Original poster
Drove down to our regional spring event yesterday where I had inspection (passed with Stebro 2nd cat delete pipes), oil change and a compression test done on the cooling system.
Dumping coolant follow up - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run temp
No successful repair reported for this finding.
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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 · Original poster
Drove around locally to bring up to temp., 1/8" over the 180 mark which has been my running temp for the last three years, and experienced no overheating or coolant dump.
Dumping coolant follow up - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test done
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 · Original poster
Drove down to our regional spring event yesterday where I had inspection (passed with Stebro 2nd cat delete pipes), oil change and a compression test done on the cooling system.
Dumping coolant follow up - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 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: 20261027T035758Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Had my local P-car mechanic mail me a new filler cap #.03. I installed this cap and added distilled water to the reservoir. Drove around locally to bring up to temp., 1/8" over the 180 mark which has been my running temp for the last three years, and experienced no overheating or coolant dump. Cap also make a sigh when you unscrew it not unlike opening a new jar that has vacuum seal. Drove down to our regional spring event yesterday where I had inspection (passed with Stebro 2nd cat delete pipes), oil change and a compression test done on the cooling system. Test showed no loss of pressure or leakage. I am hoping that the cap alone does the trick. We are planning a trip down to Parsippany NJ next Sun. for the Zone 1 concours. That trip should tell the tale but I have more confidence in driving the car with the new cap in place. I will keep you all posted.
AKL
I know this has been discussed, but I'm still running with the #.01 cap. Does anyone feel I should update to the newest #.03 just for the sake of it?; I haven't experienced any problems after 7 years and 15k miles.
If it's working for you, no need to replace it. But, it is 7 yrs. old and if nothing else has been in service long enough to possibly fail. It's plastic, which can warp from heat cycling and does have an 'o' ring which will wear out sooner or later, both of which can cause it to leak under pressure. If you have a system pressure checker such as the
stant
or
KD
you can pressure test the cap and seal.
I wouldn't run right out and get one as long as yours is working because they're prone to progressive, not sudden failure - keep an eye on the trunk lid for signs of condensation. But, they are cheap and if ordering parts, say from sunset or such, I'd probably throw one in. Possibly save a little on S/H.
If you look at the inside of your trunk lid right above the cap you might find some white residue or some condensation. If thats the case you need a new cap. If not then you probably can live what you have until it fails.
i have a 99 boxster that kept dumping coolant and i finally resolved it b
y changing the reservior, it had a small leak and was a common issue in the boxster.
Did you notice any water pooling up under the reservoir? Or was the leak so small that the amount of coolant leaked immediately evaporate? I had no water under my tank so I think the cap will be the answer. Thanks for you contribution.
AKL
This is a source reference. Confirm exact model applicability in the original material.
