yes, see here for experience with friends fan (syncro with 450 w fan,
slightly diff wiring). Ended up as a failed "on" second stage relay
and a bad temp switch.

http://shufti.wordpress.com/2010/04/01/rad-temp-sensor-story/

alistair

On 1-Jun-10, at 10:22 AM, Andrew Martin wrote:

<snip>

I've replaced a few of these over the years for NOT turning the
radiator fan
ON but never had one of these sensor/switches fail in the ON
position.  Has
anyone else?  Do you think the heavy rain had anything to do with the
failure or is that just a coincidence?  I can't quite see the rain as a
factor but.it's a Vanagon!

Andrew

Bainbridge Island WA