Go Back   986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Post Reply
 
LinkBack Thread Tools Display Modes
Old 08-10-2011, 07:58 AM   #1
Registered User
 
Join Date: Jan 2010
Location: Redmond, Wa
Posts: 369
Bleeder Valve up when the coolant is hot?

Hi,

I replaced my bleeder valve last week, after that I drove a couple of days with it up to bleed the system a little.
Yesterday when I got back home, I wanted to close the valve, however it was stuck up, after engine (and coolant) cooled down I could close the valve normally.
I took a drive to heat the engine again and bleeder valve was up again..

Is it normal?

Sasha

PS: My old valve was deformed and my coolant boiled a bit so I added some coolant and water hence the need for bleeding it

sasha055 is offline   Reply With Quote
Old 08-10-2011, 11:26 AM   #2
Registered User
 
Join Date: May 2011
Location: Miami florida
Posts: 1,591
Its normal. As the coolant heats, the valve goes up.
__________________
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
san rensho is offline   Reply With Quote
Old 08-10-2011, 11:49 AM   #3
Registered User
 
Join Date: Jan 2010
Location: Redmond, Wa
Posts: 369
Thanks

Then what's the point of opening the bleeder valve to bleed the system, if it opens when coolant is hot by itself...

Also if valve is open there will be always condensation on the trunk lid, I didn't see it before my old valve broke.

Sasha
sasha055 is offline   Reply With Quote
Old 08-10-2011, 01:22 PM   #4
Registered User
 
Lil bastard's Avatar
 
Join Date: Feb 2008
Location: Du Monde
Posts: 2,199
It is definitely NOT normal. The valve is intended to stay closed until manually opened. If it were to open, it would lower the boilover point of the coolant - the system is supposed to operate at 13psi.

I suspect that:
1.) you did not get the right part
2.) the part is defective
3.)you installed it incorrectly
4.) you didn't close it correctly

Cheers!
__________________
1990 Porsche 964 Carrera 4 Cabriolet
1976 BMW 2002
1990 BMW 325is
1999 Porsche Boxster
(gone, but not forgotten)
http://i933.photobucket.com/albums/a...smiley-003.gif

Never drive faster than your Guardian Angel can fly!
Lil bastard is offline   Reply With Quote
Old 08-10-2011, 01:29 PM   #5
Registered User
 
Join Date: May 2011
Location: Miami florida
Posts: 1,591
Quote:
Originally Posted by Lil bastard
It is definitely NOT normal. The valve is intended to stay closed until manually opened. If it were to open, it would lower the boilover point of the coolant - the system is supposed to operate at 13psi.

I suspect that:
1.) you did not get the right part
2.) the part is defective
3.)you installed it incorrectly
4.) you didn't close it correctly

Cheers!

I thought the same, but I beg to differ. My bleeder valve stays up all the time when its hot and my system has a new coolant tank and waterpump, absolutely no condensation and no loss of coolant. See the following for an explanation of how the bleeder works.

http://forums.rennlist.com/rennforums/boxster-and-boxster-s-986-forum/635082-coolant-bleeder-question.html
__________________
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
san rensho is offline   Reply With Quote
Old 08-10-2011, 02:43 PM   #6
Registered User
 
tonycarreon's Avatar
 
Join Date: May 2009
Location: Frederick, MD
Posts: 1,396
Quote:
Originally Posted by san rensho
I thought the same, but I beg to differ. My bleeder valve stays up all the time when its hot and my system has a new coolant tank and waterpump, absolutely no condensation and no loss of coolant. See the following for an explanation of how the bleeder works.

http://forums.rennlist.com/rennforums/boxster-and-boxster-s-986-forum/635082-coolant-bleeder-question.html
you're talking about two different things - the clip and the valve. you can flip the clip up to force the valve open all the time to burp the system, but it should not pop up on its own. the valve may open from time to time to relieve pressure (should be rare) but if you see the clip pop up on its own, something's wrong.
__________________
"Speed has never killed anyone, suddenly becoming stationary... that's what gets you."
tonycarreon is offline   Reply With Quote
Old 08-10-2011, 06:32 PM   #7
Registered User
 
Join Date: Sep 2010
Location: Singapore
Posts: 228
sasha, did you notice that the new breather valve (the black plastic tip) actually sits alittle higher than the original old one, when it is installed ? Thereby the metal clip is alittle looser on the new valve than the old one ?? Noticed that on mine.

Anyway, to your question - on my new breather valve, the black tip is high up (sometimes to the point that I can flip the metal clip up with little tension) when the engine is hot. But with the new coolant bottle, I don't have any condensation at all.

When I had condensation after installing the new valve, it was traced to 3 hairline fractures on the top of the coolant bottle (caused when I re-installed the new breather valve because I thought something was wrong as the black tip sat abit higher than the old one It was fine after the first install).

Check your coolant bottle for cracks - mine was so fine, that almost missed them... they were like little fine scratches on the black plastic surface and partly covered by the breather valve.

Last edited by shlim8; 08-10-2011 at 06:40 PM.
shlim8 is offline   Reply With Quote
Old 08-11-2011, 07:10 AM   #8
Registered User
 
Join Date: Jan 2010
Location: Redmond, Wa
Posts: 369
Thanks everyone,
After reading all explanations.. it actually makes sense

After some more investigations it seems that my condensation was coming from coolant cap. I have the new cap (04 version) but the threads on the tank were old, also the plastic cover that you put on the tank was kinda stopping in one of the plastic ribs on the tank which made it impossibile to screw the cap tightly.

I cut the plastic cover a little and added some PTFE tape on the threads on the tank.. and after 2 hr drive no more condensation so far.

Thanks
Sasha

sasha055 is offline   Reply With Quote
Post Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 02:23 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page