7 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH718 CS - Coolant Filler Question - Page 1 - Boxster/Cayman - PistonHeads UK
Reported or suspected cause
leak etc
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
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 suspect a cause
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause · Original poster
I know there is a common issue on 2018 cars for issues with the coolant sensor, and given the car stayed in the temp range when I made it home i dont suspect a leak etc.
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
My car (981) has the one in the lower picture, but regardless of which type you have, when checking the coolant level (not driven for hours cold) you would not want the coolant to be sitting covering the "MAX" marking, so as close to that but below it as possible.
Leading evidence: 'leak etc' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'leak etc' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check coolant level (not driven' (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.
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
My car (981) has the one in the lower picture, but regardless of which type you have, when checking the coolant level (not driven for hours cold) you would not want the coolant to be sitting covering the "MAX" marking, so as close to that but below it as possible.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check coolant level (not driven
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
My car (981) has the one in the lower picture, but regardless of which type you have, when checking the coolant level (not driven for hours cold) you would not want the coolant to be sitting covering the "MAX" marking, so as close to that but below it as possible.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
leak etc
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.
Suspected cause · Original poster
I know there is a common issue on 2018 cars for issues with the coolant sensor, and given the car stayed in the temp range when I made it home i dont suspect a leak etc.
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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 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: 20261026T161109Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Morning PH'ers,
Last night I did a short (10~ minute) journey in the Cayman before parking up for 2 hours for dinner before driving home. When I started the car on the return leg I got a ' Low Coolant' warning on the dash. I thought I would be ok to get home slowly but then got a "Top up coolant' immediately" message, so i stopped to let the car cool down.
I know there is a common issue on 2018 cars for issues with the coolant sensor, and given the car stayed in the temp range when I made it home i dont suspect a leak etc. One thing I did notice, is the coolant filler neck I have (pics below) differs from the one I have seen online.
Mine
:
Ones I have seen online
:
I was planning on buying a top up bottle of coolant to keep in the car, but cant see the min level. The red float is also 'missing' from mine?
Not sure if there is a new (or old) version of this part, or even a distinction between UK/US parts but just want to check nothing is wrong.
Cheers
My car (981) has the one in the lower picture, but regardless of which type you have, when checking the coolant level (not driven for hours cold) you would not want the coolant to be sitting covering the "MAX" marking, so as close to that but below it as possible.
My 718 has the same coolant filler as the top picture like your car.
They do like to eat water pumps - and this can throw all sorts of odd errors with the coolant level / temp sensors.
esuuv said:
My 718 has the same coolant filler as the top picture like your car.
They do like to eat water pumps - and this can throw all sorts of odd errors with the coolant level / temp sensors.
Which engine is this, the 4 cylinder?
esuuv said:
My 718 has the same coolant filler as the top picture like your car.
They do like to eat water pumps - and this can throw all sorts of odd errors with the coolant level / temp sensors.
Same style for my 718 2.0. The 'max' is at the base of the filler neck. I'd refill and then monitor. If it drops there'll be a leak somewhere and if the water pump has never been changed that's where I'd look. Then you have the 'rabbit hole' of chasing any issues with the vacuum lines and various solenoids to make sure there's no water in the vacuum system. It took my Indy 3 visits to get it right after the pump was changed and then identfying the faulty solenoid. Perfect once done and I never went near the coolant cap ever again.
From memory a new pump is c£200 and not too difficult to fit.
Make sure you've got the revised coolant cap (has the psi rating on it) and don't overtighten. When closed it should align straight (horizontal).
Thanks all - I will top it up (carefully) and keep an eye on it. Never had any leaks under the car and the level has been stable for the past week.
I assume any tell tale signs of external leaks would be the usual white smoke etc
My 718 GTS 4.0 showed a low coolant level at about 2500 miles from new, many months after first use. Now on about 11,500 miles, and the warning has never showed again. I think they just take their time to "burp" themselves of any air in the system occasionally.
Liam
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