10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHUnknown leak...
Leading reported evidence
Replace air oil separator
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
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Leading evidence: 'Replace air oil separator' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check coolant leaks' (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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Suggestion · Original poster
Additionally, where else should I be checking for coolant leaks?
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Suggestion
My car is a cabriolet and it was impossible to repair w/ motor in.
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Suggestion
My AOS passes a vacuum test (5" water) but my coolant reservoir shows a very small drop in level from MAX.
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Suggestion
Would a vacuum test of the AOS detect this type of problem?
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.
10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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: 20261027T082735Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all,
Have a 2001 996 coupe C2.
Recently had my water pump and thermostat done. When I got the car back I noticed the coolant level in the expansion tank was a bit low, but I figured they just didn't fill it all the way so no worries.
I have now been checking it regularly and have noticed it has continued dropping down and is now below the "MIN" line.
I took a look under the car and saw what seems to be a leak on the driver side ahead of the transmission leaking down the underbelly of the car. I only have one photo and it is not great be warned, but if anybody knows if this is a common leak point maybe you can help me out. As a point of reference in the photo, you can see the transmission oil drain plug in the foreground and I have circled the leak in red. In the bottom right corner you can see the transmission rubber mount.
Additionally, where else should I be checking for coolant leaks?
New radiators, new expansion tank and almost all coolant EPDM lines have been replaced.
OP - De Jeeper is near 100% correct, oddswise. Look at these locations below. The bottom you should see with a mirror. The top two you can snake a camera in there pretty easily over bank 1 side.
Thanks De Jeeper and Hatchetf15, Hatchetf15 where can I find a higher resolution of that image source you provided? I can't quike make out the details.
There are a number of places to find these diagrams. One of my go-to's is Auto Atlanta.
http://www.autoatlanta.com/porsche-p...section=104-10
Good luck!
AOS� mine started leaking there. At first few drips turned into a steady stream. My car is a cabriolet and it was impossible to repair w/ motor in. Not my primary car so i dropped the motor and took care of some other maintenance items as well. Good luck in finding your solution. This forum is so awesome and there are ALOT of super knowledgeable people on here to help out.
I had a slow leak on my car that I could not find for a year or so. Finally went to an AutoZone and got a coolant system pressure tester from their tool loaner program. Took about 10-15 minutes to find the leak, it was a hose clamp on a hose toward the bottom of the expansion tank that was not tight enough and was not easily visible, but with pressure in the system is was pretty easy to find. There are a lot of hoses (something like 26) in these cars and lots of clamps so the pressure tester is very helpful and costs nothing under the loaner program, you buy the tool and get a full refund when you return it!
Would a vacuum test of the AOS detect this type of problem?
The reason I ask is I too have occasionally smelled the sweet aroma of coolant recently. My AOS passes a vacuum test (5" water) but my coolant reservoir shows a very small drop in level from MAX. The reservoir was last changed in 2008 so I plan to change it again since it is past time anyway.
The AOS was changed in 2020.
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