But shouldn't the pressurized expansion tank cap let off the extra pressure?   I comtemplating getting a new cap from the VW dealer.

Funny thing is that the dealer's sensor price they gave me was right in line with the on-line vendors, (~21.00)  but the cap was $25.00, vs. less than $9.00 for the on-line vendors.

John

-------------- Original message --------------
From: "Jim Felder" <jim.felder@gmail.com>

> That's what it was on my vanagon. Blown head gasket or cracked head.
> Check it out now. Don't wait for the worst to happen like I did.
>
> Jim
>
> On Tue, Aug 26, 2008 at 9:54 AM, John Reynolds wrote:
> > I had a coolant level sensor develop a split late last year, I replaced it and
> now with less than 1,000 miles since that time, the new sensor has split as
> well. I was careful tightening it.
> >
> > Could there be some reason, like too much pressure in the system that could
> create this problem?
> >
> > This is an 86, 2.1 Vanagon
> >
> > John Reynolds
> > LiMBO
> >