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Porsche 996 Water Temperature- Drops going Uphill - Page 1 - Porsche General - PistonHeads UK

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8 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHPorsche 996 Water Temperature- Drops going Uphill - Page 1 - Porsche General - PistonHeads UK

Leading reported evidence

Check would be the coolant level

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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.

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Suggestion

First thing to check would be the coolant level.

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Porsche 996 Water Temperature- Drops going Uphill - Page 1 - Porsche General - PistonHeads UK
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Leading evidence: 'Check would be the coolant level' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check would be the coolant level' (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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1 matching discussions · 8 captured posts examined · 1 partial discussions

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Use engine mounted sensor

Suggestion or failed attempt

No successful repair reported for this finding.

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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
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion

(Sometimes the ECU will use an engine mounted sensor, but the gauge uses one in the front radiator).

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Porsche 996 Water Temperature- Drops going Uphill - Page 1 - Porsche General - PistonHeads UK
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.

Check would be the coolant level

No successful repair reported for this finding.

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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

First thing to check would be the coolant level.

Original post Read captured discussion
Porsche 996 Water Temperature- Drops going Uphill - Page 1 - Porsche General - PistonHeads UK

Use engine mounted sensor

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

(Sometimes the ECU will use an engine mounted sensor, but the gauge uses one in the front radiator).

Original post Read captured discussion
Porsche 996 Water Temperature- Drops going Uphill - Page 1 - Porsche General - PistonHeads UK
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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.

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

  • PistonHeads: 1 discussions

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Generation: 20261027T011819Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I guess the topic describes the issue. My water temperature gauge drops from 80 to 45 on steep hills. Once on the flat it reverts to 80. A sensor issue? Any suggestions welcome.

POST 2Original post

Air in the system? Have you tried releasing the bleed clip and driving it for a while?

POST 4 / ORIGINAL POSTEROriginal post

nebpor said: What happens if you drive steep downhill? The gauge returns to normal. Do these things have a normal thermostat?

POST 5Original post

Yes - only thing unusual about the cooling system is the large volume of coolant, given it has to loop right to the front of the car and the radiators there! Hopefully someone more experienced can chip in - might be better of in the "Engines and drivetrain" forum, where most of the mechanical experts lurk

POST 6 / ORIGINAL POSTEROriginal post

nebpor said: Yes - only thing unusual about the cooling system is the large volume of coolant, given it has to loop right to the front of the car and the radiators there! Hopefully someone more experienced can chip in - might be better of in the "Engines and drivetrain" forum, where most of the mechanical experts lurk Thanks, I will repost over there.

POST 7 / ORIGINAL POSTEROriginal post

nebpor said: What happens if you drive steep downhill? The gauge returns to normal. Do these things have a normal thermostat?

POST 8Original post

First thing to check would be the coolant level. Second thing to look for would be the location of the sensor that drives the dashboard temp gauge. (Sometimes the ECU will use an engine mounted sensor, but the gauge uses one in the front radiator). If it was in the radiator, or in an expansion tank, for example, the sensor could find itself sitting in air instead of coolant, as any air in the system rises to the highest point.

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