8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPassenger side coolant leak on the rear of the engine.
Reported repair
Replace o-ring
Reported resolution
1
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 report a fix
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.
Passenger side coolant leak on the rear of the engine.
Read full discussion summary
Leading evidence: 'Replace o-ring' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, the most frequently mentioned possible cause is 'coolant casting port' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace o-ring' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Replace o-ring', supported by resolution reports in 1 discussions. 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 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 originally thought it was the coolant casting port on the passenger side head, but that was not the case.
Passenger side coolant leak on the rear of the engine.
Replace oil cooler o-rings
Suggestion or failed attempt
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 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
Anyone dropping trans to do ims or aos should replace oil cooler o-rings on 10+ year old car as preventative "while you are in there"
Passenger side coolant leak on the rear of the engine.
Replace probably 2 of each - (in
Suggestion or failed attempt
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 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
Good question - I also looked it up on the porsche parts diagram - one ring is for coolant and line and other for oil line - not sure which is which - Id replace all - probably 2 of each - (in
Passenger side coolant leak on the rear of the engine.
Test done
Suggestion or failed attempt
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 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
have a pressure test done to help you locate/pinpoint the source of the leak.
Passenger side coolant leak on the rear of the engine.
Replace probably 2 of each - (in
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
Good question - I also looked it up on the porsche parts diagram - one ring is for coolant and line and other for oil line - not sure which is which - Id replace all - probably 2 of each - (in
Passenger side coolant leak on the rear of the engine.
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.
8 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: 20261027T025149Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello Rennlist,
I've got a small coolant leak on the passenger side of the engine that is driving me nuts. I've got dampness around the lower bellhouse junction with small drips in the surrounding area. All drips are along the centerline and passenger side of the car. There is dampness on the passenger side head as well, and if the car sits for long enough coolant will propagate and drip from the forward most(car direction) header stud. Although, primary drippings are from bellhouse junction and surrounding area. There are no drips further back than the previously mentioned header stud.
I originally thought it was the coolant casting port on the passenger side head, but that was not the case. Although, if you are familiar with the layout that area is still damp. The gasket has sense been replaced.
After doing some research it looks like the oil cooler may be the culprit. However I have heard some mention that the AOS can leak as well.
I've had the car up on stands on two different occasions trying to diagnose the source but I can't seem to see anything.
Any ideas?
It is a 2002 C4S.
I've done a poor man's pressure test which was in inconclusive; it will hold coolant pressure for days, yet still drips on the floor.
Thanks for the feedback, I'll look more closely at the oil cooler considering it may be the only plumping in that area.
I had coolant staining near oil cooler - but never noticed a leak. When I did ims/rms - I had indie look at oil cooler coolant hose connections - o-ring degrades over time and I think more than one person on the board here has also had to do this. Indie replaced o-ring and fixed the problem. Anyone dropping trans to do ims or aos should replace oil cooler o-rings on 10+ year old car as preventative "while you are in there"
Good question - I also looked it up on the porsche parts diagram - one ring is for coolant and line and other for oil line - not sure which is which - Id replace all - probably 2 of each - (in
ut pipes) - cheap insurance
This is a source reference. Confirm exact model applicability in the original material.
