hope this is the coolant tank
08-31-2018 | 10:32 PM
#1
Thread Starter
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Joined: Oct 2016
Posts: 713
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From: Michigan
hope this is the coolant tank
i just put the interior all back in my car and had an awesome drive today and then come outside a few hours to see this.... ughhhh crap
i think its the darn coolant tank and i already have a new one + the updated cap sitting in a box, it had already stopped leaking by the time i saw it. I am going to pressurize the tank tomorrow and see if its really that. No overheating, no white smoke etc so I am pretty sure its not something serious.
i could see a small amount of coolant on my exhaust tip months ago so thats why i purchased the tank, wasnt expecting to leak that much
wish me luck !
09-01-2018 | 04:29 AM
#3
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Agreed, and that tank does look to be original. I replaced my coolant tank about a month ago and I can tell you it's not fun. I would suggest that you also replace the level sensor as that is likely to get broken in the process. They're only about $40 from a dealer, probably less online.
09-01-2018 | 11:11 AM
#4
Three Wheelin'
Joined: Aug 2018
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I've read many many thread on this subject and how these tanks are known to crack over time. Which surprises me because I have owned cars that are over 30-40 years old and the coolant expansion tanks are one of the few things that still hold up. But not on these cars? Make me wonder why... Is it the combination of the heat and high pressure of the cooling system? Or, just sorry plastic composite? I guess if it wasn't such a hard thing to replace, I guess it would be such a hot topic.
09-01-2018 | 02:00 PM
#6
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From: Ormond Beach, FL
Well, I can tell you mine has lasted for 142K miles and is a little over 20 years old (car manufacture date 7/98). I have flushed and refilled coolant several times in the course of other projects. I always use 50/50 Porsche coolant and distilled water. My tank has not yellowed like some I have seen. Also latest -04 coolant cap. And, it is hot in Florida so it gets a pretty good workout most days. I would say if it ain't broke, don't fix it.
09-01-2018 | 02:29 PM
#7
Intermediate
Joined: Mar 2017
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From: SF Bay Area
Everything is engineered to give out after a certain amount of miles/time 
I replaced mine a few weeks ago because the same thing happened to me. It is really hard to tell where the leak is coming from as there could be hairline cracks hidden in the seams or on the side facing the inside of the rear quarter. I paid about $600 to have mine replaced (which I think is worth it unless you have the time, tools, and energy to do it yourself). Part is about ~$250 if I remember correctly.
I replaced mine a few weeks ago because the same thing happened to me. It is really hard to tell where the leak is coming from as there could be hairline cracks hidden in the seams or on the side facing the inside of the rear quarter. I paid about $600 to have mine replaced (which I think is worth it unless you have the time, tools, and energy to do it yourself). Part is about ~$250 if I remember correctly.
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09-01-2018 | 04:25 PM
#8
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Well, I can tell you mine has lasted for 142K miles and is a little over 20 years old (car manufacture date 7/98). My tank has not yellowed like some I have seen. Also latest -04 coolant cap. And, it is hot in Florida so it gets a pretty good workout most days. I would say if it ain't broke, don't fix it.
09-03-2018 | 11:31 AM
#10
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From: Michigan
as everyone says its a royal pain to do this
i took the time to replace the spark plugs & tubes which had no oil in there and looked fine anyway and upgraded to the newer ignition coils also since i had planned to do all of that anyway and had the parts
also removed the pse exhaust and going to try the muffler bypass for a while
now i have to do the pass side... but its to darn hot so i am waiting a few days until it cools down
09-04-2018 | 10:21 PM
#11
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From: Michigan
finished and fixed
holy crap aftermarket headers + catless + muffler bypass = insanely loud, to loud for me and i like it loud. so i will be trying to add cats to see if that helps
holy crap aftermarket headers + catless + muffler bypass = insanely loud, to loud for me and i like it loud. so i will be trying to add cats to see if that helps