Sounds like the temp switch to me.

-Simon

On Jul 5, 2009, at 9:26 AM, Matt Sutton <msutts@EARTHLINK.NET> wrote:

> Hi Folks,
>
> My radiator fan won't kick on, and I'd love to hear thoughts about
> diagnosing and fixing it. Here's what I know:
>    -30 amp fuse for the fan is intact.
>    -I tried the Ken Wilford trick of placing a jumper wire between the
> terminals at the temp sensing switch behind the lower grill, and got
> nothing. There is 13 volts present there, though, when the van is
> running.