08-09-2013, 09:50 AM
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#21
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recycledsixtie
Join Date: Nov 2011
Location: Edmonton Canada
Posts: 824
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My coolant cap from my indy shop is blue and says Germany on it. However there are no numbers on it. It could be made in China for all I know!?
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08-09-2013, 10:50 AM
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#22
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Registered User
Join Date: Feb 2012
Location: california
Posts: 92
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i changed mine to new cap last month with 45k.coolant was flowing out vent hose,i replaced cap and no more problem
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08-09-2013, 10:57 AM
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#23
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Registered User
Join Date: Oct 2008
Location: Ohio
Posts: 868
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Original cap. 45K miles. No issues.
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08-09-2013, 11:31 AM
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#24
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Porsche
Join Date: Jul 2013
Location: Wyoming
Posts: 28
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Quote:
Originally Posted by trimer
can someone help me here? How would a coolant cap keep you from losing coolant? I see on here that coolant was low, etc but no leaks...where is it going and how would a cap fix it? Is it just disintegrating into thin air because the cap is bad?
Sorry for the dumb question but I am really curious. I ahve a 10 yr old car with 18000 miles on it and the original cap. but want to know what a new cap would do...
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Im in the same boat, would someone please shed some light
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08-09-2013, 11:42 AM
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#25
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,625
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Quote:
Originally Posted by Speedy2000
Im in the same boat, would someone please shed some light
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The system has a vent line that runs under the car, when the system pressure exceeds the cap pressure rating (which drops from its original 18.2 PSIG over time and with use), coolant goes out the vent and onto the ground. Now that there is air space in the surge tank, air starts circulating in the system, and you get air pockets; and the car starts to overheat. All over a part that cost about $20 and should be tested and/or replaced regularly..............
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-09-2013, 12:21 PM
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#26
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Registered User
Join Date: Apr 2013
Location: Buffalo NY
Posts: 184
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My original wasn't seated properly when I bought it and started boiled over. I replaced the cap just to be safe. That was at 79,000.
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08-09-2013, 12:36 PM
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#27
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Registered User
Join Date: Aug 2007
Location: New Jersey
Posts: 691
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My car is gone, but the new owner will get a .04 cap (whether they know enough to check it or not...)
/
__________________
SOLD - 2002 Boxster S - PSM, Litronics, De-ambered, Bird Bike Rack, Hardtop, RMS leak...
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08-09-2013, 01:10 PM
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#28
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Registered User
Join Date: Oct 2008
Location: sw ohio
Posts: 253
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Over tighten?
How do know do if you are over tightening the cap?
Should it be just snugged down?
My 2000 base always has had moisture on the underside of trunk above the cap. Now at 97,000.
Have updated cap at every cap update.
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08-09-2013, 04:55 PM
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#29
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Registered User
Join Date: Dec 2007
Location: Seattle
Posts: 735
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I replaced my coolant cap to the updated one a couple of years ago because I was getting the condensation on the underside of the trunk. Still had condensation collecting on the trunk, so after seeing dried antifreeze residue around the bleeder valve, I replaced the O-rings last month under the valve. No more condensation on the underside of the trunk now.
__________________
2000S Ocean Blue Metallic- 116K
3X Water Pump, Clear side markers, Crios Mod, Front engine mount, Flywheel, clutch, RMS, AOS, MAF, serpentine belt, power brake vacuum line, battery, 2X CV boots, Fuel filter, Oil filler tube, 3X ignition switch, 90K service, gas cap, Coolant tank
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08-10-2013, 01:40 AM
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#30
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Registered User
Join Date: Oct 2008
Location: sw ohio
Posts: 253
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Cap, O rings, and valve replaced about 1 - 2 years ago. Still get condensation on underside of trunk lid, always have. Thought the condensation was normal because of the circular seal on the trunk lid in that area, as if the engineers expected condensation and aimed to contain it. Fluid level remains between Full Low marks.
Last edited by jotoole; 08-10-2013 at 03:40 AM.
Reason: added after though Re: seal on trunk lid.
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08-10-2013, 04:46 AM
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#31
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Registered User
Join Date: Jul 2013
Location: Oslo, Norway
Posts: 325
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Damn, this got me thinking I should check mine! 98k miles and only owned the car 5 weeks, so havent really checked the levels..
Obviosuly original cap, right? Says >PA6.6GF30< under the cap. There was a high pressure that was released when I twisted it off, and also some steam! There are also white dried powder, almost cocain like, on the outside of the cap.
Should I be worried? Do I need to replace it? And where do I buy one online? 
Last edited by haz; 08-10-2013 at 04:49 AM.
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08-10-2013, 04:53 AM
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#32
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Registered User
Join Date: May 2008
Location: Toronto
Posts: 2,656
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You have a 01 cap, replace it asap. Any Porsche dealer can order it for you.
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08-10-2013, 04:56 AM
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#33
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Registered User
Join Date: Jul 2013
Location: Oslo, Norway
Posts: 325
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Quote:
Originally Posted by ekam
You have a 01 cap, replace it asap. Any Porsche dealer can order it for you.
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So getting an "OEM" from lets say ebay is a no no?
 PORSCHE 911 BOXSTER CAYMAN COOLANT EXPANSION TANK CAP | eBay
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08-10-2013, 07:22 AM
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#34
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Registered User
Join Date: Jan 2007
Location: BC
Posts: 1,350
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Replaced original cap to -01 in 2007 at around 58,000 km (36,000 miles). Now at 109,000 km (68,000 miles). No issues, but after reading this I guess I'll end up getting the -04. Sigh.
Is it just me or is this another Porsche design screw-up? How many car manufacturers redesign their coolant caps regularly...
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2001 Boxster, 5 spd, Seal Grey
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08-10-2013, 07:23 AM
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#35
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Registered User
Join Date: Jan 2007
Location: BC
Posts: 1,350
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Quote:
Originally Posted by haz
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Looks like OEM to me, at around OEM price...
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2001 Boxster, 5 spd, Seal Grey
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08-10-2013, 07:26 AM
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#36
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Registered User
Join Date: Jan 2007
Location: BC
Posts: 1,350
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Quote:
Originally Posted by JFP in PA
The system has a vent line that runs under the car, when the system pressure exceeds the cap pressure rating (which drops from its original 18.2 PSIG over time and with use), coolant goes out the vent and onto the ground. Now that there is air space in the surge tank, air starts circulating in the system, and you get air pockets; and the car starts to overheat. All over a part that cost about $20 and should be tested and/or replaced regularly..............
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Replace how regularly?
__________________
2001 Boxster, 5 spd, Seal Grey
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08-10-2013, 07:54 AM
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#37
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,625
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Quote:
Originally Posted by clickman
Replace how regularly?
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We pressure test them every time a car comes into the shop; if they don't hold until 18.2 PSIG, they go in the trash. Never tried to develop an "average life expectancy", as it seems to be all over the map. If you can't pressure test, I would replace it at least every two years.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-12-2013, 09:24 AM
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#38
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Vista glass
Join Date: Jun 2012
Location: Florida
Posts: 88
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I replaced mine at 83,500 when I did the water pump. I had the original cap and was not experiencing coolant loss. I read here to upgrade was recomended by those who know more than I. All knowledge is useless unless applied. 04 cap on now.
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08-12-2013, 10:34 AM
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#39
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Registered User
Join Date: Jan 2013
Location: Phoenix, AZ
Posts: 231
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.01, '97 with 103K mi. Not sure if it's original. WP was replaced, not sure when or what the cap of the day was at that time...or whether it was even replaced with the WP...
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08-12-2013, 11:25 AM
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#40
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jakesbox
Join Date: Apr 2012
Location: Charlotte NC
Posts: 759
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So what is the latest and greatest cap I should be ordering? Anyone with a link?
__________________
2003 996 Twin Turbo X50, PCCB, polar silver / 2004 996 Carerra Cabriolet, midnight blue, cinnamon leather, IMS Pro / 2003 Artic Silver Boxster - Short Throw Shift, IMS Upgrade, Carerra Light Wheels, De-Snorked with Evoms Cold Air Intake, GHL Exhaust (Sold) / 2002 Seal Grey Boxster - Fabspeed Exhaust, Black powder coated wheels, Porsche stripes (Sold) / 2 -1957 356 A Speedsters (signal red and seal grey) (Sold) / 1989 944 Turbo (m030 S options)
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1998 Boxster
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