9 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH991 Coolant Leak
Leading reported evidence
Check fastener torque at
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.
Leading evidence: 'Check fastener torque at' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fastener torque at' (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 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
It seems the part number has changed from 9A1 106 238 00 to OPB 121 076 and sure enough, Porsche did make some changes to the part (it took them long enough).
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.
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 · Original poster
Note the last photo in post #1 where a metal bracket is used on the coolant pipe.
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
It seems the part number has changed from 9A1 106 238 00 to OPB 121 076 and sure enough, Porsche did make some changes to the part (it took them long enough).
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.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Forum Australia: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
Now after numerous drives simply because my coolant leak was an intermittent leak and I wanted to make sure it was fixed right, no more leaks.
How many owners of a 991.1 or 991.2 have had a leak from the coolant pump or the plastic coolant pipe? I've certainly read about my share of them on Rennlist, but nothing here.
May 2020, my 2015 991.1 with under 5000 km started to leak at the joint between the plastic coolant pipe and the thermostat housing. Nothing serious in that I never had to add any coolant but it would leak the odd time when I took it for a run. I checked the fastener torque at that fitting.
I did a search in the Porsche part catalog (last one being from 2018) and the part number had not changed, not even for the newer 991.2 models, even when looking at photos on Google images. I did come across a few images of the flange that had an aluminum collar to distribute the clamping load better, but I haven't come across any information on it. I thought it might have been a factory Porsche modification.
So I placed an order at my local Porsche dealer for the plastic coolant pipe and associated O-rings. It seems the part number has changed from 9A1 106 238 00 to OPB 121 076 and sure enough, Porsche did make some changes to the part (it took them long enough).
Even though my 991.1 is still on CPO warranty, I'll be doing the job myself since I want to flush my coolant as well. I have an issue with dealers and shops working on my cars and motorcycles.
Yes, at about 12,000ks. Rang my dealer & they sent a tilt tray to collect it, fixed under warranty, no charge. Apparently rare but not unheard off. My service manager said it’s a sh#t of a job & has to be done just so, I waited 2 extra days as the guy in the workshop he wanted to do the job was on leave. If it’s not done perfectly you’ll be at it again.
My understanding is that the O ring fails randomly. I’m now at 21,000k, all good.
Coolant leak fixed. At the moment, I simply replaced the O-ring between the black plastic coolant pipe and the thermostat housing. I do have the updated black plastic coolant pipe, but it involves a bit more work to replace it. I can do so at a later time.
2015 Porsche 911 Carrera 4 GTS. Purchased from the original owner in 2018 (3y 1m after initial delivery) with 98 miles. Coolant pipe started to leak intermittently in May 2020. It was an intermittent and a slow leak. I never had to add any coolant to the coolant reservoir. Then during my first two drives in 2021, the coolant pipe leaked each time. Although I am still under CPO warranty and if anything I trust my local dealer far more than the independents, I chose to fix this myself.
I found plenty of coolant leak complaints on various forums, but it seems 991 owners had them fixed under warranty. I did come across Forrester out of the UK (a Rennlister) who clarified some of the questions I had.
Porsche 991 Coolant Leak - Now Fixed
Now after numerous drives simply because my coolant leak was an intermittent leak and I wanted to make sure it was fixed right, no more leaks.
Nice to be in the car, take longer drives and not worry. And nice to open it up now and then. But sometimes I wonder if I shoudn't have bought an Extra 300 or 330 instead. You can't get a speeding ticket or charged with dangerous driving up in the sky.
Well here we go again, coolant pipe burst today (26,000ks). 1st time it happened was when the car was 2 years old @ about 12,000ks, now 4 years later it’s happened again. All I can say is thank goodness for taking out extended warranty. Dumped ALL the coolant in about 100mtrs
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Update!!!
Advised by PCSS today that I’ve had a water pump failure. It will be replaced under the extended warranty. Did a bit of research & apparently this is a common problem for 991.2 & some 718s. In the USA Porsche NA have issued a 10 year warranty on water pumps, it’s also an issue in the UK, but no 10 year warranty if you’re outside the USA. Once again thank goodness for extended warranty.
Additional info that I came across some months ago. Note the last photo in post #1 where a metal bracket is used on the coolant pipe.
Porsche Technical Information
Parts required are:
1 x 9A1 106 338 00 - Coolant Thermostat Housing Retaining Bar.
3 x 9A7 008 129 00 - E-Torx M6 x 35.
I bought the above parts and have kept them in case I ever need them.
The same applies to the revised coolant pipe that I bought and it would only be replaced if the coolant pump fails. The only way to replace it is when you have full access to the coolant pump and that is more involved.
So far my coolant leak repair that I performed in June of 2021 has been trouble-free for over 3 years.
This is a source reference. Confirm exact model applicability in the original material.
