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YOUR RESEARCHAnother Faulty Coolant Expansion Tank - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Fill first tank had a leak
Performed · outcome unconfirmed
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Performed · outcome unconfirmed · Original poster
They were both vacuum filled the first tank had a leak near the overflow hose and the second one seems to come from the breather valve not quite sure as of yet.
Another Faulty Coolant Expansion Tank - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Fill first tank had a leak' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Fill first tank had a leak' (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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Another Faulty Coolant Expansion Tank - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace o rings and it seems ok now
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Another Faulty Coolant Expansion Tank - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace cap
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Suggestion · Original poster
I did replace the cap because I knew it was an issue.
Another Faulty Coolant Expansion Tank - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace o-rings a year later
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Suggestion
Genuine Porsche although I did have to replace the o-rings a year later.
Another Faulty Coolant Expansion Tank - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed actions (5)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Fill first tank had a leak
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
They were both vacuum filled the first tank had a leak near the overflow hose and the second one seems to come from the breather valve not quite sure as of yet.
Another Faulty Coolant Expansion Tank - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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13 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
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Generation: 20261026T205155Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
So now I have replaced the coolant overflow tank twice and the second tank is defective also. I am at my wits end now
, so before I call Porsche to order one, I wanted to know where did the other Canadians on this site order their tank and what was your experience?
They were both vacuum filled the first tank had a leak near the overflow hose and the second one seems to come from the breather valve not quite sure as of yet.
Actually I did have to pull it out twice, now that I think about it.
I bought a replacement level sensor so I wouldn't have to go back and replace that later, as that requires pulling the tank. Of course, the new sensor was faulty.
I called the local dealer and they want 404.00 for the tank another 101 for the pressure valve and 32 for the cap. That's 537 plus tax seems a little too much.
Yeah, well, that's the cost of admission. Or you can cheap out on the aftermarket part and do the job over and over until you finally get a good one, which will likely fail within a couple of years anyway.
Can-Ti may be good enough for the Honda, but certainly not for the Porsche. Definitely not for a coolant tank. Did the money you saved on the parts cover the additional time and aggravation?
I did get a full refund at least that's a positive spin on it. Yes it's been a pain to do the job twice I agree but I can't believe that we can't get OEM tanks cheaper than that. I am sure there is sources out there who have a good product.
But what about the cap? If your old cap was worn and could not hold the required pressure, perhaps air was still in the system and caused your issues. This commonly occurs when the old tank from factory is flushed and the revised cap is not installed, the plastic goes from hairline crack to spilling all of the coolant on the road. Risky.
You also run the risk of having one of those air pockets get hot and it crack the head. Milkshake time... all because of a little $20 piece of round plastic.
I bought mine through my indy (rombotis). Seems that the pressure valve was included but not the cap. Genuine Porsche although I did have to replace the o-rings a year later.
I did replace the cap because I knew it was an issue. The new tank is leaking from the bleeder valve. I changed the o rings and it seems ok now. I will test it out this weekend when I take it for a drive.
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