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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHStrange fluid leak...
Reported or suspected cause
coolant tank
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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Reported cause
Then about a month later, I started getting the hot coolant smell, and this time it was the coolant tank.
Leading evidence: 'coolant tank' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'coolant tank' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check coolant cap, and fluid 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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Performed · outcome unconfirmed · Original poster
Update- I replaced my cap with the new one, and no leaks (again) for about 2 weeks.
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Performed · outcome unconfirmed · Original poster
So I finally replaced the tank (bought from Sunset and had my Indie do it), and since then, I've driven about 1,500 miles, no loss of coolant, no drips, level steady on max line.
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Performed · outcome unconfirmed
I'm thinking about just replacing the whole dang thing before I run into anything like this.
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Suspected cause · Original poster
I thought it was the cap initially, but turns out it was indeed the tank.
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Performed · outcome unconfirmed · Original poster
So I finally replaced the tank (bought from Sunset and had my Indie do it), and since then, I've driven about 1,500 miles, no loss of coolant, no drips, level steady on max line.
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Suggestion
Because of all the similarities in both failing within less than a month, I think the evidence more or less strongly suggests you replace the tank along with the new cap.
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Suggestion
You may not see any drips on the the garage floor, like mine, but the tank still had many tiny cracks that expand-out under hot/pressurized running condition and the leak occurs.
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23 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T112012Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Question for you all- I recently got a 996 with 46.3K on it- I've had it a month, and put about 800 miles on it. No drops on garage floor at all- until yesterday...
After I parked it (it was driven about 60 miles), there were two 4"puddles under the left rear- behind the rear wheel. It was slowly dripping from right where the left exhaust tip is, and further from the header also. It's not oil, I know that. It feels too slippery, however, to be coolant, and does not smell like coolant. It stopped shortly thereafter. Fluid is relatively clear- hydraulic, maybe? There is no sprayed or splashed fluid in the engine compartment that I can see.
Anybody seen this? Opinions? Thanks!
yes check your coolant expansion tank level. Place something to collect the dripp. You with that much comming out it you will be able to see the color and know which it is quickly.
Before you go replacing the entire tank (which is a known problem) make sure the cap is in good shape. I've been told many times now that the coolant tank caps only last a couple years before needing replacement.
Thanks, guys...I'll check the coolant cap, and fluid level. I didn't smell any radiator fluid smell, at least I didn't notice...it did fell awfully slick for radiator fluid, though...
Yes...good advice from Slant911. My first run-in with drips was in fact the coolant tank cap...so I bought the new cap. Then about a month later, I started getting the hot coolant smell, and this time it was the coolant tank. In both cases, I could see white crusty residue....the first time around the mouth of the coolant tank under the rim of the cap...and the second time looking down underneath the coolant tank with a flashlight....cottage cheese looking "white stuff" on a ledge under the tank.
I haven't done very many do-it-yourself projects; but I did tackle the coolant tank following the step by step DIY instructions and photos from RennTech.....with more than a few loud adjectives....and jiggling the tank in and out....but I got it done. Not that difficult of a job now that I look back on it. The biggest problem with DIY projects for guys like me who haven't done a lot of them....is lack of confidence. But if you follow the directions...and query the guys on the forum...you can get thru it just fine.
Thanks, guys- Here's an update- the dripping stopped late the same day I noticed it last weekend. I would guess total fluid loss to be about 1-2 ounces. Not much.
So I go out for a nice 200+ miles on Saturday- after I added about 1/2 cup or so distilled water in the tank, which took it right to the median between the low and high marks. Nice drive, pretty conservative, only took it to ~6k once or twice. Lots of highway. Temp guage stayed straight up at 180, right between the 8 and the 0. Didn't waver a bit. Didn't notice any of the "cottage cheese" anywhere in the pre drive walkaround. Temp outside was about 75.
When I get home and park, no drips, no nothing coming out. Fluid level is the same. Sunday morning, garage floor is dry. Not a drop. Everything appears normal. Is it possible that some fluid can come out of the bleeder valve? Perhaps it was just discharging excess fluid last week. I dunno. I ordered the new tank, which I'll keep on hand, but it sure seems fine for now. Anyone had this happen?
You may not see any drips on the the garage floor, like mine, but the tank still had many tiny cracks that expand-out under hot/pressurized running condition and the leak occurs. Therefore you might smell the coolant as it evaporates on the exhaust manifolds, but don't see any drips on the floor. Since you have smelled and seen some drips already, like others have told you, you may want to order the new tank and newer cap to get ready (well-known problems for 996)... Good luck.
Cheers,
It's inevitable if it's the stock tank.....mine did the same, leak a bit & then nothing
for several days.....then leak again.
Better to do it sooner than later & risk having to leave the car somewhere it does not belong and/or getting it towed to get fixed.
thanks for this thread...had a very visible leak today...lots of "cottage cheese" residue around the driver side exhaust pipe and a tad around the tank cap. Found no visible cracks on the tank...looks like it was just coming out on top and dropping down the tube attached to the over fill part of the tank. Just picked up a new cap for $20 from the dealership (part # 996 106 447 01). This should do the trick!
Thanks again for this thread!
My '02 has 33K miles on it now. I'm thinking about just replacing the whole dang thing before I run into anything like this. Smart move or just wait till it shows signs of leaking?
Have you thought about flushung the coolant throught the rear drain plug? Use VW pink antifreeze with dionized water. I did it to mine and it smells like a new car.
Regards,
Update- I replaced my cap with the new one, and no leaks (again) for about 2 weeks. Then, lo and behold, two small puddles behind the rear wheel. So I finally replaced the tank (bought from Sunset and had my Indie do it), and since then, I've driven about 1,500 miles, no loss of coolant, no drips, level steady on max line. I thought it was the cap initially, but turns out it was indeed the tank.
Kind of hard to say that the new cap "causes" the coolant tank to go. I had the same issue...replaced the cap, then three weeks later came out of a shop to find coolant pooling under the left rear. Because of all the similarities in both failing within less than a month, I think the evidence more or less strongly suggests you replace the tank along with the new cap. I'm not a big believer in coincidence.
I actually think that most people replace the cap "first" hoping it will fix the problem....all along the tank was already cracked & just got worse,
This is what happened in my situation.
I had the same problem last year. I the tank has turned yellow I would replace it.
2000 Porsche 996 C2 Cab
Eibach springs.
Short shifter B&M.
Fabspeed Exhaust.
Headers
Agency Power Rear Adj. Control Arms
OBC Switch, MP3 Wired.
280 x 18 Pilot Rib
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