Ed:
Mine cracked above the threads so no amount of thread seal would help.
Just replace it. I wish I had. It left me stranded in B.F.Egypt on a
Sunday.
Drive Safely & Good Luck
Ken Lewis     <Kernersville NC, The Heart of the Triad>
86 VW Transporter Three Door Pickup
60 Porsche T-5 Coupe
85 VW GL Vanagon<Elvis>lives again!

On Thu, 23 Oct 1997 18:50:58 -0700 Ed Henckel <ednjudy@EPIX.NET> writes:
>Alain Thibault wrote:
>>
>>  Expansion Tank Cooling
>> Sensor Leak. I don't really understand what it means and how serious
>> this might be. Is it something that can be fixed easily without
>going to
>> a Repair Shop ?
>
>Alain:
>
>I was waiting for someone in the group that had more repair experiance
>than me to answer your problem, I had the same. I have been trying
>ways
>to stop the leak at the temp switch with a number of different O rings
>and using pipe tape on the threads, To no avail! My expansion tank is
>just to the left of the coolent tank that you get to from the licence
>plate. Take off the engine cover to work on it.
>
>Couldn't buy just the NOS O ring so bought the whole switch. Part #251
>919 372 cost $8.60 US. Problem solved! Easy fix, Disconnect, screw out
>old and screw in new and connect.  Good luck....
>
>Ed Henckel
>'86 Westy
>Mt Bethel, PA
>