23 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHLeaking Coolant - What is this part?
Leading reported evidence
Replace expansion tank, 05 ctt
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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Performed · outcome unconfirmed
just replaced my expansion tank, 05 CTT with 77k miles
Leading evidence: 'Replace expansion tank, 05 ctt' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'overflow is' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check actual cooling system level' (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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Discussions that suspect a cause
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Suspected cause
Another point to suspect overflow is that the grooves inside reservoir, that coolant has to go through on way out, we're all wet.
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Suggestion
A big question I have is where do I check the actual cooling system level?
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Suggestion · Original poster
Since I'm already replacing that valve...might as well change those hoses and clamps.
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.
23 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
6SpeedOnline: 1 discussions
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Generation: 20261026T120458Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
So I'm leaking collant. Saw some yellow stains on the garage floor so I took out the plastic protective cover underneath towards the engine and found this part leaking. Can someone tell wth is this part called? It is attached to some rubber hoses and the leak originates from the space between the white plastic and the black plastic. Searched for this in the 996 catalog but couldn't find it. Help pls!
Here's a video of the part while its leaking...
You Tube
Parked car in garage after work. Today wake up, get into garage and find this (pic below). Right away start swearing. Get my juices going.
Anyone can suggest possible areas to look at?
Remember about 3 or 4 weeks ago I 'topped' up the coolant reservoir (container with the blue cap on driver side of engine compartment). Topped it up not to the upper edge of yellow plastic that says 'max', but to the bottom edge of the container opening (black plastic edge that the blue cap screws into).
It was much cooler then still outside. Over last few days it's been much hotter around here and I wonder if the resevoir just overfilled and let coolant out the overfill hose on that container.
Any ideas? Really appreciate it. Thanks.
Hello
@fullmetaljacket
,
Is this the part you are looking for ?
Part#: 928-574-573-04
$128 usd for genuine, or $18 for aftermarket...
https://www.pelicanparts.com/More_Info/92857457304.htm?pn=928-574-573-04-M253
Johnny
.
Pic of resevoir and where level is at now after purge. Appears to be at upper edge of the yellow plastic.
When I initially topped up, it was up to bottom edge of black plastic.
Wow! Yes! That is exactly it! Thanks so much Johnny! Not only did you identify the part but you pointed me to the right store! Thank you sir!
Now let me figure out how to install this thing and post my DIY here.
Cheers!
Tracked coolant to this spot, above the upper control arm. Wonder where the overflow piping is with relation to this dripping. Or does this indicate possible resevoir fail. Help appreciated always.
Quote:
I believe that it regulates the coolant flow into the transmission oil cooler, another post called it a heater control valve, so depending on where it is mounted on your vehicle may determine it's use, but the only pictures I found were for the transmission cooler.
Some pictures from the internet.
Johnny
.
Got it! Thanks again! Now the challenging part is being careful not to break the extremely rusted metal bracket. Will do another search for the hoses and clamps. Since I'm already replacing that valve...might as well change those hoses and clamps.
That's what I assumed based on looking at the hoses coming off the reservoir. However I wasn't able to actually see the end of the hose.
Another point to suspect overflow is that the grooves inside reservoir, that coolant has to go through on way out, we're all wet.
After I removed excess from reservoir with syringe, the leaking stopped. So will have to keep an eye on it.
A big question I have is where do I check the actual cooling system level? At the reservoir? Since reservoir had extra fluid that gets sucked in if needed. I was looking for the rad cap so I can open to see the fluid level at the rad core, but this car seems different and I couldn't find the cap. The only place I can check is the reservoir.
Well, its been a few days since the initial spill observation.
Since I removed extra coolant from reservoir and kept level at MAX (top edge of yellow plastic with the MAX lettering on it), no coolant spill was observed.
Looks like my assumptions on reason for spill were correct.
Case closed.
Oh by the way, got all the parts for this DIY and unfortunately they don't have the PLATE in-stock (part# 99630740100) Have to wait a few weeks for it. Contemplating on just fabricating this part but the curved portion will be the challenge.
Quote:
It probably says in the manual, but most cars, when COLD you fill to the MIN mark.
The MAX mark is used to indicated where the level will be when the engine is HOT.
I would also never open a cap when the engine is HOT.
Makes sense when the engine is hot it expands the coolant to the max mark.
Everything still good? My expansion tank started leaking intermittently for months. The tank was manufactured with a seam that is prone to fail. Add to the list of things to worry about.
Pelican has a page on the problem.
http://goo.gl/OuCYTl
RennTech has some pics of the split.
http://goo.gl/usMuY3
Yes. Since I remedied the problem there have been no further leaks. I am confident I overfilled. That was one of my worries? Split expansion container but no, no problem here. Knocking on wood.
When I had mine the expansion tank split where the 2 plastic pieces meet. You can pick one up for about $75. It takes about an hour or so to do. Only because Porsche loves to put 10 pounds of sugar in a 5 pound bag. Just remove the head light and torque arm and you should be most of the way done.
This is a source reference. Confirm exact model applicability in the original material.
