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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 Cab drain channel and water collection tray leak
Reported or suspected cause
rear drain tube
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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Reported cause · Original poster
The obvious problem was the rear drain tube that was broken, which we have seen before on here (photo included, and another 10k).
996 Cab drain channel and water collection tray leak
Read full discussion summary
Leading evidence: 'rear drain tube' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'rear drain tube' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Recommend second opinion' (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
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996 Cab drain channel and water collection tray leak
Replace so, tubes
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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.
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Performed · outcome unconfirmed · Original poster
So, tubes were replaced, but there are still drops of water coming from the drainage system.
996 Cab drain channel and water collection tray leak
Run into the body of the car
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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
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Performed · outcome unconfirmed · Original poster
Upon replacing the harness it was determined that there was also damage to another wiring harness that ran into the body of the car.
996 Cab drain channel and water collection tray leak
Recommend second opinion
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
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Unsuccessful attempts
1
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996 Cab drain channel and water collection tray leak
Repair along
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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Discussions that contain suggestions
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Suggestion · Original poster
The shop sourced a used harness and made the repair along with draining and replacing all fluids (another 15k) I finally get the car back after over 2 years!
996 Cab drain channel and water collection tray leak
Replace fluids (another 15k) i finally get the car back
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.
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Suggestion · Original poster
The shop sourced a used harness and made the repair along with draining and replacing all fluids (another 15k) I finally get the car back after over 2 years!
996 Cab drain channel and water collection tray leak
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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.
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Generation: 20261027T000231Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
This is the bottom of the drain channel/tray before water exits behind the rear wheel. There�s a slow drip/leak from the plastic. Unfortunately I could not get the video to load
Broken drain tube that was replaced
Any experience with the water collection tray/drain on a 996 C4 Cab?
A lot of challenges over the past 2.5+ years. I attempted to keep this short in hopes of not losing everyone but it was just too hard!
August, 2023, my 2002 C4 Cab wouldn�t start. Diagnosis, rodents had chewed on the engine wiring harness (~13k usd). Upon replacing the harness it was determined that there was also damage to another wiring harness that ran into the body of the car. After over a year of waiting for the harness from Porsche the shop was told they would not be able to provide the harness, ever, and we would have to repair or find another solution. The shop sourced a used harness and made the repair along with draining and replacing all fluids (another 15k) I finally get the car back after over 2 years!
It rained hard the day that I picked the car up. The first day the shop had the car outside in the 2 plus years. It wasn�t raining when I picked it up and after a quick drive on the highway (maybe three miles) I put the car in the garage for the day. The next day I got into the car and noticed a slight musky smell. I didn�t think too much of it but then noticed the drivers side door sill was wet. Called the shop and they thought maybe a door drain plug was clogged. Brought it in and they noticed the entire back drivers side was sopping wet. The car was then removed of all seats, carpets, and panels to dry everything out and locate the problem. The obvious problem was the rear drain tube that was broken, which we have seen before on here (photo included, and another 10k). So, tubes were replaced, but there are still drops of water coming from the drainage system. This is now pushing 3 years and over 38K usd. We�re now being told another 9k to replace the plastic channel collection trays/drains on both sides. Apparently the convertible top and all components have to be removed to replace these drains/trays.
Has anyone experienced this or have any suggestions/recommendations?
First, make sure the drains are completely clear - they exit on the front side of the rear wheel fender liners.
Can use a length of trimmer string to help ensure no blockages exist.
That, along with the drain tubes an deflector panels in place helped cure my leak.
For what it�s worth, those corrugated hoses just press over the nipples on the trays. There�s an o-ring that goes inside the tube to help hold it in place. I recall mine looking very similar.
Thanks so much for the reply! The drains have been thoroughly cleaned and 99% of the water is flowing where it should. It�s just this small drip that seems to be sliding down the plastic tray.
You mentioned a deflector panel. I�m very curious about this. Would you happen to have any links or part information?
truly appreciate your help here. This has been driving me insane!
Thanks everyone! I genuinely appreciate all of the responses here. Great community!
I�ll keep this updated as I make progress with the hope that it helps someone else down the road.
Cheers!
