Yea John, put a new one each year... anyone here think i'm kidding??? you
should not, those cap gave me a lot of problem lately, they are JUNK!!! so
DON'T use after market one, VW as plenty and they are OEM good quality.

On top of that, Aftermarket Expansion tank are very cheap and will give you
many trouble. First, the thread for the cap will let go in a matter of time,
second, they can blow up if you overheat to much, they leak at the middle
easily... the worse, they if they don't properly keep pressure, the entire
system will suffer including the engine.

So go to VW, they are only a few more $$$

Ben

On Sun, 16 Sep 2007 11:52:51 -0400, John Meeks <vanagon@GMAIL.COM> wrote:

>Hi List,
>
>Is there a method for testing the coolant expansion tank pressure cap?
>
>we just drove Byron (85 GL) back up from his front hose breakdown (250
>mi), and the shop that replaced the hoses filled her up with some kind
>of stop leak and the cap is all gunked up.
>
>I'm wondering if a cap failure may have contributed to the hose blow
>but can't find any way to test the cap in the archives.
>--
>John Meeks
>
>Vanagon Rescue Squad
>http://www.vanagonauts.com/Vanagon_Rescue_Squad74.htm
>
>'91 Multivan, '85 GL
>Northern Michigan
>KC8ZFN