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Old 08-12-2013, 11:25 AM   #1
jakesbox
 
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So what is the latest and greatest cap I should be ordering? Anyone with a link?
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Old 08-12-2013, 11:48 AM   #2
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The part number is 996106 447 04 (the original was the same except the last two digits were 00). Available from Pelican, Suncoast, etc., etc.

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Old 08-12-2013, 11:20 PM   #3
haz
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Many responses here are "milage" and "no problems".

Isn't a coolant cap replacement, before a problem appers, the whole point? As a preventive action?

I ordered this one:
PORSCHE 911 BOXSTER CAYMAN COOLANT EXPANSION TANK CAP | eBay

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Originally Posted by trimer View Post
So what is the latest and greatest cap I should be ordering? Anyone with a link?
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Old 08-21-2013, 11:11 AM   #4
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Quote:
Originally Posted by haz View Post
Many responses here are "milage" and "no problems".

Isn't a coolant cap replacement, before a problem appers, the whole point? As a preventive action?
Well my problem was that each time the cap needed to be taken off to flush the coolant, replace either the coolant tank or water pump, all things you must be doing if you want your head to keep from cracking, the result was that the old cap could not keep a tight seal and air was coming in. This is potentially big big problem if left ignored.
Each time I immediately brought my car back to shop to get the air out but for whatever reason we didn't consider the cap to be the culprit and figured it was that the system hadn't been burped correctly. A bad guess since we were using vacuum fill so air couldn't have gotten in....unless the cap was bad.

So people who are on the original cap with no issues are probably also people who have never replaced their water pump (a potential problem) or people who have never flushed their coolant (a problem if factory coolant has been mixed with generic coolant) or someone who still has the original coolant tank (which often crack because the old cap lets air in after a flush). In other words if your going to take care of your engine properly this must include replacing the coolant cap every time you flush the coolant or replace the water pump. If you do none of these things maybe you'll be lucky. You should also replace your hoses when you do the water pump for the first time.
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Last edited by Perfectlap; 08-21-2013 at 11:15 AM.
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