Any time the low speed does not work on an 86+ large cooling fan the
resistor is a prime suspect. They do go bad fairly often. Did you put
one behind the driver's side headlight when you swapped the harness? Did
you also swap over to the larger fan motor and shroud?

Mark

dylan friedman wrote:

> Thanks Mark.
>
> I have a 86 without AC and no PS and had the small fan.
> The wiring looked like it was from older vans so I replaced it all with a complete harness from a 91 with AC.
> It only runs at hi speed, not often. Actually, it has never come on unless I idle the van for a very long time.
> The temp needle stays low on the gauge also.
> The van runs like a top and I have checked the thermo switch at the rad and checked the temp with thermo gun.
>
> Thanks to all that responded.
> My van runs great.
> I was just curious.
>
> dylan
>
> Mark Drillock <mdrillock@COX.NET> wrote: I think it is like this.
>
> 82-85 2 speeds, small fan motor.
>
> 86-91 2wd non-A/C, 2 speeds small fan motor
> 86-91 Syncro non-A/C, 2 speeds big fan motor
> 86-91 all with factory A/C, 3 speeds, big fan motor
>
> Mark
>