Porsche Club GB

Coolant Bleeder Valve on Expansion Tank

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

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YOUR RESEARCHCoolant Bleeder Valve on Expansion Tank

Leading reported evidence

Replace coolant left the 'coolant bleeder valve'

Performed · outcome unconfirmed

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that performed work without a confirmed outcome: 1

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Performed · outcome unconfirmed · Original poster
The only thing I noted is the guy that changed the coolant left the 'coolant bleeder valve' on top of the expansion tank in the upright position (open).
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Coolant Bleeder Valve on Expansion Tank

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Leading evidence: 'Replace coolant left the 'coolant bleeder valve'' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace coolant left the 'coolant bleeder valve'' (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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Run with them open all the time

Suggestion or failed attempt

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Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion
The GT3 Cup cars run with them open all the time.
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Coolant Bleeder Valve on Expansion Tank

Frequently discussed actions (2)

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

Replace coolant left the 'coolant bleeder valve'

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
The only thing I noted is the guy that changed the coolant left the 'coolant bleeder valve' on top of the expansion tank in the upright position (open).
Original post Read captured discussion
Coolant Bleeder Valve on Expansion Tank

Run with them open all the time

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
The GT3 Cup cars run with them open all the time.
Original post Read captured discussion
Coolant Bleeder Valve on Expansion Tank

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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.

2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Porsche Club GB: 1 discussions

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Generation: 20261026T200546Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi All, Last year I had the coolant changed and had been driving the car (1999 - 996) with no problems (coolant level remained OK). I unfortunately have had to leave the car standing for the last 5 months and this weekend had a chance to check it over. I found that the coolant had dropped to below 'MIN', but can't find any sign of a potential leak (rads or expansion tank). The only thing I noted is the guy that changed the coolant left the 'coolant bleeder valve' on top of the expansion tank in the upright position (open). With this in the open position, is it possible that the coolant may have evapourated over the 5 months the car has been resting? Any advise would be gratefully appreciated. Cheers, Steve

POST 2Original post

The bleeder valve is just controlling a small pipe which bypasses a section of the cooling system. It doesn't vent to atmosphere, so wouldn't cause evaporation. With the valve in the open position, it will cause the engine to take very slightly longer to warm up, but not much else. The GT3 Cup cars run with them open all the time. Can't explain the low coolant level. If there are no obvious leaks, I would just top it up, and keep an eye on it.

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