Your fan resister is likely bad. It lives behind the driver's side
headlight. It is a large green current limiting resister with 3 wires to
it. Only used for lower speed fan operation, high speed puts direct
power to the fan.

List venders sell them.

Mark

populuxe wrote:
>
> My 90 multivan seemed to have a hi & lo speed last year, at some point
> last summer only the loud or high speed has been turning  on (--the one
> that scares people in drive threws).
> I checked out Ken W's procedure at vanagain(jumpering at radiator sensor
> with 3 connection plug).
> Yes--the hi/loud speed terminal will turn on but the low terminal wont.
> I have checked at the motor.  one brown ground. ok .  And this is what
> puzzles me--two reds that junction together on the (plus)terminal stud
> on motor.  I applied 12v from batt to each of the reds.  both run it at
> High speed(as I then find out they are connected).
> I am more familiar with a.c..motors than this d.c.
> Bentley not very helpful.
> What test steps should i take next.
>
> Thank you,
> chris c
> wisconsin