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Strange Turbine Noise on Cold Start – Video Included - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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YOUR RESEARCHStrange Turbine Noise on Cold Start – Video Included - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Replace water pump, and thermostat

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 · Original poster
For context, the car recently had an oil change, water pump, and thermostat replaced, but the noise was already present before that work.
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Strange Turbine Noise on Cold Start – Video Included - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Leading evidence: 'Replace water pump, and thermostat' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace water pump, and thermostat' (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.

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1 matching discussions · 3 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

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

Replace water pump, and thermostat

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
For context, the car recently had an oil change, water pump, and thermostat replaced, but the noise was already present before that work.
Original post Read captured discussion
Strange Turbine Noise on Cold Start – Video Included - 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.

3 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: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi everyone, For the past few months my 2001 Boxster 2.7 has been making a strange noise on cold start only, and I’m trying to get some peace of mind about it. The sound appears about 5 seconds after startup, only when the car has been sitting for about a week or more and the engine is fully cold. It lasts roughly 1–2 minutes, then disappears completely and the engine sounds normal. The noise is high-pitched and almost metallic, the closest comparison I can think of is something like a small turbine or metal shaving / rotating metal sound. It seems to come from the passenger side of the engine bay. For context, the car recently had an oil change, water pump, and thermostat replaced, but the noise was already present before that work. I’m told this might be the secondary air pump, which would make sense since it only happens during cold start, but I wanted to ask here and get some feedback from other owners. I made a short video so you can hear it — the sound starts around the 5-second mark: https://youtube.com/shorts/4rou4bkALb4 Does this sound like a secondary air pump starting to age, or something else I should look into? Thanks in advance for any thoughts.

POST 2Original post

For sure the air pump. Mine is similar, but not quite as loud.

POST 3 / ORIGINAL POSTEROriginal post

Thanks @danimal

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