04-08-2016, 02:27 PM
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#21
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Registered User
Join Date: Dec 2008
Location: Queensland, Australia
Posts: 1,522
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Retro...
Even if its a suspect cap, there is a good chance that air has got into the system which means you will have to lift the D ring on the relief valve for a couple of heat cycles & top up the coolant accordingly.
__________________
2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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04-08-2016, 02:28 PM
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#22
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Registered User
Join Date: Sep 2008
Location: Agoura Hills (LA) So.Cal.
Posts: 1,574
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Quote:
Originally Posted by Retroman1969
Interestingly, I just made my first longish trip to a remote job, and when I opened the trunk the cap was hissing and gurgling, and steam dropping from all over the deck lid..
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Air pocket worked its way to the top?
__________________
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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04-08-2016, 04:03 PM
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#23
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Registered User
Join Date: May 2013
Location: Oklahoma City
Posts: 856
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Quote:
Originally Posted by Chuck W.
Air pocket worked its way to the top?
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That's what I'm thinking. 
Nonetheless, I picked up a new cap and will switch them out in the morning.
Thanks Steve, will do! I guess I have to take that top cover off while the caps are removed to get to it.
Thanks again guys!
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"Remember, I'm pulling for ya! We're all in this together."
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04-08-2016, 06:45 PM
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#24
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Registered User
Join Date: May 2013
Location: Oklahoma City
Posts: 856
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I let the car cool down for several hours. Coolant was low, so I topped it off (with the proper matching coolant) and put on the new cap. However I noticed that my new, new cap is very different from my old, new cap.
The one with the mesh vent is the one I'm replacing. The solid one is the new, new one. Does the difference matter?
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"Remember, I'm pulling for ya! We're all in this together."
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04-08-2016, 09:51 PM
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#25
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Multi-Boxer Driver
Join Date: Nov 2010
Location: Orange Park, FL
Posts: 1,408
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What's the part number on the new new one, and on the old new one?
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-Chris
2004 Porsche Boxster 2.7
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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04-09-2016, 01:49 AM
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#26
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Registered User
Join Date: May 2013
Location: Oklahoma City
Posts: 856
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Both have the number: 996.106.447.04
At least I assume that's the part number? It's the only number I can find on either.
Thanks!
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"Remember, I'm pulling for ya! We're all in this together."
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04-09-2016, 06:54 AM
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#27
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Registered User
Join Date: Jun 2015
Location: Massachusetts
Posts: 97
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The one with the mesh looks like the first replacement cap I got for mine off of amazon. Had the same part number but was made by bilstein I think. It worked just fine as the coolant stopped dropping after I put it on. But ultimately I got the genuine one that has the mesh anyway and have the bilstein as a backup.
__________________
2003 Boxster S
2004 Carrera Cab
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04-09-2016, 07:08 AM
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#28
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Registered User
Join Date: Sep 2008
Location: Agoura Hills (LA) So.Cal.
Posts: 1,574
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Ten months ago (July '15) I replaced the water pump and other items including the cap. I got the same part number as you posted including the .04 at the end. Mine is looks like the one you're replacing with the mesh.
__________________
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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04-10-2016, 04:16 AM
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#29
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Registered User
Join Date: May 2013
Location: Oklahoma City
Posts: 856
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Thanks for the input guys! I went ahead and put the new one on, and removed the cover so I can access the bleed valve. We'll see what happens.
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"Remember, I'm pulling for ya! We're all in this together."
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04-10-2016, 05:02 AM
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#30
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Registered User
Join Date: Feb 2016
Location: New England
Posts: 296
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Quote:
Originally Posted by Retroman1969
Interestingly, I just made my first longish trip to a remote job, and when I opened the trunk the cap was hissing and gurgling, and steam dropping from all over the deck lid. 
It's running cool, and no puddles, but I wonder if the new cap has gone bad? It's as tight as I can get it. I alerted my shop, who is ready to come get me with his enclosed trailer if it looks bad.
This has been an...... Interesting week.
Updates to come I'm sure.
PS: no, I don't believe I changed the coolant with the new cap last year. But it had recently been flushed and serviced at the time. |
Retro, sounds like you might have some air bubbles in the system. Did you try flipping up the release valve?
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04-10-2016, 06:12 AM
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#31
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Registered User
Join Date: May 2013
Location: Oklahoma City
Posts: 856
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I'm trying that technique now.
I appreciate the input, I think you guys are on the right track.
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"Remember, I'm pulling for ya! We're all in this together."
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