08-09-2017, 06:12 AM
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#1
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Registered User
Join Date: Mar 2016
Location: Spain
Posts: 985
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00 Boxster S coolant over flow
Hi,
I am experiencing a strange issue with my 00 S. Twice after arriving home I have had coolant over flowing. Car temps are 80-90, seems to happen after using the AC and ambient temp of around 39-48c I live in Southern Spain. I did notice that the over flow tank when cool is over the full mark a tad. The coolant it looses is about a half a cup or so.
I think it may be just loosing fluid because of expansion, otherwise no leaks anywhere else noticeable.
Any thoughts?
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2000 Boxster S Ocean Blue Metalic
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08-09-2017, 06:22 AM
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#2
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Registered User
Join Date: Sep 2008
Location: Agoura Hills (LA) So.Cal.
Posts: 1,574
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It could be something as simple as the coolant tank cap. Look at the part number on it. If it doesn't end in .04 you have an early one that are known for failing. This happened to me. Start there. Good luck and keep us posted.
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1995 Porsche C4 Cab
2016 BMW M2, 6 Speed LBB - ED 7/2016
1997 993 Cab - Sold; 1997 993 Turbo - Sold
2001 Boxster S - Original Owner - 30K Miles -SOLD
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08-09-2017, 06:28 AM
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#3
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Registered User
Join Date: Mar 2016
Location: Spain
Posts: 985
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That was replaced a little over a year ago. Just the strangest problem. I drove it 80 miles in the cool am arrived to my destination checking for overflow zero. Trip home AC same distant big outside temp increase arrive home and over flow. Maybe I will check the cap again I took it off before the trip to verify coolant level. I haven't added any and it still is above the max line. Thanks for your thoughts.
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2000 Boxster S Ocean Blue Metalic
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08-09-2017, 07:48 AM
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#4
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Project Addicted
Join Date: Aug 2015
Location: Eastern Shore, MD
Posts: 623
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Who filled it up over the max line???
Why??
You can pull some out with a baster.
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Jon
1966 912, 1976 911
1986 944, 2000 Boxster
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08-09-2017, 07:53 AM
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#5
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Registered User
Join Date: Aug 2013
Location: Ottawa, ON
Posts: 452
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Like many of us the coolant res tank probably old and has a crack in it that you cant see because its on the inner side. This is common and happened to me... had to get it replaced. I bought a Porsche knockoff about 6 years ago online ebay and its still going strong. Installing it was a huge pain so I recommend a garage to do it.
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DrCactus
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08-09-2017, 07:54 AM
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#6
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Registered User
Join Date: Aug 2013
Location: Ottawa, ON
Posts: 452
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Just noticed it was replaced already.... check cap.... wrap the tank with papertowel including the cap and drive for a while and check to see what part is wet.... give you an idea of where the leak is
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DrCactus
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08-09-2017, 11:44 AM
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#7
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Registered User
Join Date: Mar 2016
Location: Spain
Posts: 985
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Some good suggestions. Wierd part is on time there is anty over flow is after a drive in the high temps in the afternoon.
Been monitoring the level for a month doesnt go down and no indications of any leaking otherwise. Will try paper towel test. Maybe minor seepage.
The over fill must have been mechanic, I have had the car a little over a year. I have had one service a year ago almost. I really dont drive it as much as i should, mostly weekend and Friday car.
__________________
2000 Boxster S Ocean Blue Metalic
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08-09-2017, 01:11 PM
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#8
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Registered User
Join Date: Jul 2009
Location: Arlington Heights, IL
Posts: 1,561
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Make sure the cap is not cross-threaded, very easy to do.
Make sure the cap is very-very tight, not very easy to do.
Pull up your trunk carpet, and look for coolant.
Good luck.
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08-09-2017, 01:41 PM
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#9
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Registered User
Join Date: May 2011
Location: Miami florida
Posts: 1,591
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It could just be over filled. My tank was over filled and I was getting condensation on the trunk lid where it seals over the tank. I wasn't losing any coolant out of the overflow hose, just condensation. Now that the coolant level is correct, there's no condensation.
__________________
Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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08-09-2017, 06:55 PM
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#10
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Registered User
Join Date: May 2013
Location: North Alabama
Posts: 2,079
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Oh so true
Quote:
Originally Posted by Flavor 987S
Make sure the cap is not cross-threaded, very easy to do.
Make sure the cap is very-very tight, not very easy to do.
Pull up your trunk carpet, and look for coolant.
Good luck.
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reverse until you feel the threads engage and then tighten
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08-09-2017, 08:43 PM
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#11
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Registered User
Join Date: Mar 2016
Location: Spain
Posts: 985
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Thanks for all of the input. As a matter of fact i did notice some condensation before also. Will check the threading on the cap also. Some good advice. Will post an update tommorrow.
__________________
2000 Boxster S Ocean Blue Metalic
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