Sounds like you have a bad ground for the fan motor. A brown wire comes
back from the motor and plugs into the ground star behind the fuse
panel. The connection there gets corroded and cooked. Look for the
largest brown wire that plugs into the ground star, that will be for the
fan motor.

Mark

Matt Sutton 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.
>     -inspected the large resistor behind the drivers side headlight.
> Visually it seems ok; when I had to replace one before it had cracked open.
>     -perhaps unrelated, but the dash blower motor is down, too. I found that
> the fuse for that had blown, and a replacement blew immediately. The blower
> had been noisy and reluctant for a while, so I'm guessing it finally seized.
> But maybe there's a shared relay that got harmed in the process?
>
> Thanks in advance, and I hope you're all well.
>
> Matt Sutton
> Brooklyn NY
> 88 Gl manual
>