I have had to replace mine twice in the last four years.  You probably have
a crack in the plastic cap.  The part should be under twenty dollars.

Julianna
90 VW Vanagon Westfalia
76  VW Automatic Bay Westfalia
74 VW Beetle

----- Original Message -----
From: "Chad G" <groch@WORLDCHAT.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, October 06, 2001 1:33 PM
Subject: Leaking Coolant Sensor

> I have coolant escaping from around the coolant sensor at the top of the
> expansion tank.  Air is passing through it as well. Do I have to replace
the
> entire sensor or can you buy just the o-ring that goes around the top of
the
> sensor??
>
> thanks,
> Chad 85GL's