Coolant bleeder question
#1
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2000 2,7. I'm getting a slight coolant leak; condensation on the trunk. I changed the bleeder valve and now it stays in the up position when the car is hot. Is it supposed to do this and it is the source of the leak?
#2
Three Wheelin'
Join Date: Oct 2004
Location: Lesa, Italy & Atlanta, GA
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this is normal behavior. that valve isn't just for bleeding the system, it's a pressure regulator. when the coolant gets hot, some of it vaporizes. vapor is a crappy heat conductor, so the system is designed to vent the vapor into the overflow tank, keeping the system primed with liquid only. when the car cools, a vacuum is created in the system that then draws liquid from the tank back into the system. that 'bleeder valve' regulates all of this, and will be in various stages of open/closed while the car is warm.
also note that this setup means that the system is self bleeding. once the initial bleed is done when the coolant is filled, any remaining air will be purged through the overflow tank.
sometimes you will get vapor condensation because the reservoir cap itself is bad. porsche actually changed the design somewhat, so you may want to replace it as well.
also note that this setup means that the system is self bleeding. once the initial bleed is done when the coolant is filled, any remaining air will be purged through the overflow tank.
sometimes you will get vapor condensation because the reservoir cap itself is bad. porsche actually changed the design somewhat, so you may want to replace it as well.
#5
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There are 2 o-rings under the base of the bleeder valve that might be the problem. I put a new cap and bleeder valve on my 2000 S and still saw condensation. Totally dry after doing the o-rings. Here are a couple pictures I took when I had the bleeder valve body apart.
![](http://i19.photobucket.com/albums/b199/Dale_K/bleedervalve026.jpg)
![](http://i19.photobucket.com/albums/b199/Dale_K/bleedervalve026.jpg)
![](http://i19.photobucket.com/albums/b199/Dale_K/bleedervalve024.jpg)
#7
Race Director
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The tank can be a pain to replace. I had no place to work on my car when its tank failed and gushed hot coolant out just ahead of the rear tire so I took it to a dealer.
Tech said the job was not hard but 'fiddly'.
But there are several DIYs articles on this around. One trick is to buy the right tool to unclip/loosen the hose clamps. That's all I know. Check with DIY articles for more reliable/accurate info.
Sincerely,
Macster.
Tech said the job was not hard but 'fiddly'.
But there are several DIYs articles on this around. One trick is to buy the right tool to unclip/loosen the hose clamps. That's all I know. Check with DIY articles for more reliable/accurate info.
Sincerely,
Macster.