Planet-9

991.2 coolant system fault - Fixed

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Original source

3 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH991.2 coolant system fault - Fixed

Leading reported evidence

Test with no fault code again

Performed · outcome unconfirmed

No successful repair reported for this finding.

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 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
Tested with no fault code again and
Original post Read captured discussion
991.2 coolant system fault - Fixed

Frequently discussed work

Check vacuum lines and change-over valves

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
step is disassemble the rear to check the vacuum lines and change-over valves
Original post Read captured discussion
991.2 coolant system fault - Fixed

Read full discussion summary

Leading evidence: 'Test with no fault code again' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check vacuum lines and change-over valves' (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 · 3 captured posts examined · 1 partial discussions

Compare 2 other evidence results

Check vacuum lines and change-over valves

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
step is disassemble the rear to check the vacuum lines and change-over valves
Original post Read captured discussion
991.2 coolant system fault - Fixed

Check whole vacuum system hoses and the infamous change-over valves

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
I have seen a lot of posts discussing this and would like to check the whole vacuum system hoses and the infamous change-over valves
Original post Read captured discussion
991.2 coolant system fault - Fixed

Frequently discussed actions (3)

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

Check vacuum lines and change-over valves

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
step is disassemble the rear to check the vacuum lines and change-over valves
Original post Read captured discussion
991.2 coolant system fault - Fixed

Check whole vacuum system hoses and the infamous change-over valves

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
I have seen a lot of posts discussing this and would like to check the whole vacuum system hoses and the infamous change-over valves
Original post Read captured discussion
991.2 coolant system fault - Fixed

Test with no fault code again

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
Tested with no fault code again and
Original post Read captured discussion
991.2 coolant system fault - Fixed

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.

Planet-9: 1 discussions

0 evidence records excluded for query context · 1 excluded by outcome qualification · 0 adjusted by outcome qualification.

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

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

POST 1Original post

Hi, My 991.2 C2 GTS recently starts to throw white coolant system warning light No leakage of coolant and coolant temperature is fine Diagnostic tool reads DTC P1433, vacuum system leakage I have seen a lot of posts discussing this and would like to check the whole vacuum system hoses and the infamous change-over valves I have the 991.1 version of workshop manual and I know there is no such file floating around on the internet. I ordered one month access to eAutoRepair for 991.2 but found out it’s actually 991.1 In the 991.1 workshop manual there is an article specifically about the vacuum system. I would like to check what’s the differences between 991.2 and also the instructions about how to remove the spoiler, tail lights and so on Any advise is appreciated

POST 2Original post

I checked the PSE and A/C heater today PSE does not work. The valves of both sides are always open no matter engine is on or off Heater works fine Next step is disassemble the rear to check the vacuum lines and change-over valves

POST 3Original post

After taking off the bumper, I quickly found that the connection of the T shape and the silver metal vacuum hose is loose. it takes some time for me to remove the air filter to reach there and re-connect it Tested with no fault code again and PSE works

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