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986 Running hot (Found solution) - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH986 Running hot (Found solution) - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Run on porsche coolant

Performed · outcome unconfirmed

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 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 · Original poster
This is my second 986, previous ran on porsche coolant then eventually prestone after changing the pump, both gave a low and stable temp.
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986 Running hot (Found solution) - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed work

Replace pump, both gave a low and stable temp

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
This is my second 986, previous ran on porsche coolant then eventually prestone after changing the pump, both gave a low and stable temp.
Original post Read captured discussion
986 Running hot (Found solution) - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Read full discussion summary

Leading evidence: 'Run on porsche coolant' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace pump, both gave a low and stable temp' (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 · 4 captured posts examined · 0 partial discussions

Compare 3 other evidence results

Replace pump, both gave a low and stable temp

Suggestion or failed attempt

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
This is my second 986, previous ran on porsche coolant then eventually prestone after changing the pump, both gave a low and stable temp.
Original post Read captured discussion
986 Running hot (Found solution) - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run these cars

Suggestion or failed attempt

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
If you run these cars on pure water, they run fine and at the appropriate temperatures, customers running the entirely wrong types of coolant do not have over heating issues; so why would this particular coolant cause this?
Original post Read captured discussion
986 Running hot (Found solution) - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run with temps regularly above the "180"

Suggestion or failed attempt

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
Symptom: 1999 986 running with temps regularly above the "180" on the temp gauge.
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986 Running hot (Found solution) - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed actions (4)

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

Replace pump, both gave a low and stable temp

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
This is my second 986, previous ran on porsche coolant then eventually prestone after changing the pump, both gave a low and stable temp.
Original post Read captured discussion
986 Running hot (Found solution) - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run on porsche coolant

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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 · Original poster
This is my second 986, previous ran on porsche coolant then eventually prestone after changing the pump, both gave a low and stable temp.
Original post Read captured discussion
986 Running hot (Found solution) - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run these cars

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
If you run these cars on pure water, they run fine and at the appropriate temperatures, customers running the entirely wrong types of coolant do not have over heating issues; so why would this particular coolant cause this?
Original post Read captured discussion
986 Running hot (Found solution) - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run with temps regularly above the "180"

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
Symptom: 1999 986 running with temps regularly above the "180" on the temp gauge.
Original post Read captured discussion
986 Running hot (Found solution) - 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.

4 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.

1 acknowledgements have no verified action link; they do not establish a repair result.

Outcome without a verified action link
Notes: the Peak was purchased mid 2020, water wetter was added later on with no change in temps.
Original post Read captured discussion
No unique explicit quoted action; no causal link assigned

Generation: 20261026T133652Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Posting this for posterity: Symptom: 1999 986 running with temps regularly above the "180" on the temp gauge. Mods: after market headers, cat delete, RoW programming, after market exhaust, low temp thermostat. Solution: moved from Peak pink coolant to Prestone for all vehicles. Result: stable temps from the third mark to the right edge of the "180" Notes: the Peak was purchased mid 2020, water wetter was added later on with no change in temps. This is my second 986, previous ran on porsche coolant then eventually prestone after changing the pump, both gave a low and stable temp. For a long time I thought the temp was just the result of having a less restrictive exhaust. If you're having problems with your temps then try changing to a different coolant.

POST 2Original post

Quotes source post: 668319

Sorry, but that makes no sense. If you run these cars on pure water, they run fine and at the appropriate temperatures, customers running the entirely wrong types of coolant do not have over heating issues; so why would this particular coolant cause this?

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 668320

No idea-- when I changed it, I didnt flush the peak coolant, just drained and refilled; all the seals, caps, and clamps are the same. The peak has Potassium 2-ethylhexanoate and Sodium 2-ethylhexanoate, in addition to the glycols. The prestone only lists glycols and bitterant.

POST 4Original post

Quotes source post: 668321

None of which would alter the thermal transfer properties of the coolant mix. Something else was wrong, like a stuck thermostat or a trapped air pocket. It was not the coolant............

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