16 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSpewing Coolant
Reported or suspected cause
cap
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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 identifying 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.
Leading evidence: 'cap' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'cap' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Fill after dropping some hoses' (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 report identifying a cause
1
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Reported cause
The culprit was large air bubbles within the system.
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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Reported cause
I�ve had the same happen - despite a cap that turned out to perfectly functioning.
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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Performed · outcome unconfirmed · Original poster
Now it's getting it filled after dropping some hoses near the engine.
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Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
This was the first time I ran the car with the burp valve in the down position.
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Suggestion
the reason why i didn't is that i couldn't maintain negative pressure (due to a likely leak in the expansion tank) using the Maddox kit i bought from harborfreight.
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.
16 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.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
I thought I had it resolved by putting on a new cap.
Hello Rennlisters!
I've been working on this car for several months now. It's chronicled here.
https://rennlist.com/forums/996-foru...r-project.html
I go the thing to run and am blowing a misfire on cylinder 1 code. Tracking that down. I have only driven it 20 miles or so in 3 trips.
I'm back to the loosing coolant like crazy scene which I chronicled here.
https://rennlist.com/forums/996-foru...lant-leak.html
There is UV dye in the system which is why the color of the coolant is not pink.
I thought I had it resolved by putting on a new cap. It is spewing coolant like crazy. Does that cap just need to really tightened up hard?
The car ran this morning for a few miles. I was stopped at a red light when I heard a rushing noise. I thought it was the SAI system coming on. Then there was steam rising up from the back of the car.
So I pulled it over to an Urgent Care place figuring it may help. Maybe I was wrong on that count. I was able to observe it gushing coolant into the overflow catch "pan" that's integrated into the coolant tank. It did it for several seconds. Long enough to take pix and then figure I should take video. It came to a stop at the end of the video.
You Tube
You can see it gushing for the first few seconds. It did that for 20 or 30 seconds or so.
Did you leave the burp valve upright position while driving? Leave it up like I did. You likely have plenty of air in the system like I did.
Funny thing is i didn't have this issue while driving the car (except that one time at gas station) but rather mostly when car was
idling and attempting to fill with coolant. I find that the cap only needs to be tightened until initially cannot be turned anymore.
The air should be released around the blue cap as it has that pressure release valve on it.
There is something wrong with that cap. I would replace the cap immediately and make sure the seal is in place (inside the cap). And yes, it must be very tight on the coolant tank.
Ensure all the air is evacuated from the system and replace the cap with a new Porsche one since they are cheap.
At first glance at the picture it appeared as if you sprayed coolant on the back of the Red Toyota parked several slots down!
Interesting reflection and thank you.
This was the first time I ran the car with the burp valve in the down position. I left it up for the first 15 miles. I guess I thought I got all the air out.
Mine also happened at idle at a red light.
Yay!
I�ve had the same happen - despite a cap that turned out to perfectly functioning. The culprit was large air bubbles within the system. As soon as I came to a stop/turned off the engine, coolant came gushing out (half a gallon at minimum).
Apparently, coolant needs the vacuum to keep its pressure/heat in check. Air bubbles allow the coolant to cook, triggering the 15psi lock on the coolant cap.
From your other thread on coolant refill issues, last I saw, you still had a gallon or so left to fill, yes? That's alot of air to expand when hot, and you seem to have been dealing with this for a while.
At what point do you think you might drain all the coolant, get an AirLift to vacuum the system, and try to refill that way?
https://rennlist.com/forums/996-foru...pump-tips.html
I used the linked method, and an AirLift. Drove for a week with the bail up, added only 200mL total after the initial fill. It was very easy with no issues.
since you won't have problem filling with a vacuum unit just get it done this way. the reason why i didn't is that i couldn't maintain negative pressure (due to a likely leak in the expansion tank) using the Maddox kit i bought from harborfreight.
the kit itself is well made with the adapter appropriate for our tank opening. $74.99 --- cheaper than Uview. Of course you need a pneumatic air compressor as well. Get the McGraw 3 gallon pancake compressor for $69.99 and the appropriate hose/connectors for couple of bucks. I suggest also getting some plumber thread sealing tape to use on the output of the compressor and the tubing as i had leaks through that as well.
https://www.harborfreight.com/coolin...ressure+tester
https://www.harborfreight.com/air-to...sor-57567.html
they have both in stock at their store in Nashville.
hate to see those precious pricey porsche coolant going to waste.
Does it not leak coolant when you start it with the trunk open? Seems quite heavy to not see something while the car idles, maybe try driving slow while someone watches with the trunk open. A lot is on top, and gravity generally pulls the downward direction. Air bubbles is the only other thought that was mentioned.
Well now this is an interesting take, and an obvious one. Yes, I keep fighting with it figuring I can do it with out the vacuum tool. Initially it was the cap and that got resolved.. Now it's getting it filled after dropping some hoses near the engine.
The reason i though this method could work when only cracking the system at the rear is because I have read about folks doing it here. "All you gotta do is pop the tab up for a while". Which I did and thought it was good. this morning was the first time I flipped the tab down.
It holds pressure over night so there are no leaks. It's surprising how much different this machine is from everything else I have worked on. Been working on foreign and domestic cars for 40 years. this is my first Porsche.
All is well. Thank you for your insight
Mine is holding pressure over night. So agreed to problems there.
I do have an air compressor so that is good to go.
Thanks for taking the time to help with this. It seems we are both in the same boat, at least a little bit. How is your car doing?
Car is fine. Haven't had the need to fill it for several days. No overflow.
I've stopped keeping the burp valve upright. The other day it remained up on its own. Again no overflow.
I must had not completely drained out all the old coolant as i originally thought.
I was not able to accurately measure the volume discarded as some ended on the floor haha.
But i did have at least 4.5 gallons that i was able to collect and appropriately discard.
Funny cause I used the method described before to use compressed air to force fluids out.
I do keep half a gallon of coolant in the frunk in case it needs some in future. Temp is stable w/ spirited driving.
For you --- just keep the valve upright for several more days, go for several drives, and keep eye on the temp.
Once i decide to replace the expansion tank i will absolutely perform the vacuum method as everyone
seems so damn keen in suggesting over and over haha.
�It's surprising how much different this machine is from everything else I have worked on.�
How many of them had the engine in the rear, the radiators up front, a bunch of pipes and hoses connecting them and contained 6 gallons of coolant? I�d guess not many
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