Your 86 should have 3 fan speeds for the radiator cooling fan.

The temp switch in the radiator controls speeds 1 and 3. The A/C system
controls speed 2.

There is a large resistor that is used to slow down the fan for speeds 1
and 2. This is the likely culprit if the fan runs at only the highest
speed when you hot wire the fan switch. The highest speed does NOT use
the resistor. The resistor is a very common part to fail and it comes up
on the list as a problem constantly.

The resistor lives behind the driver's side headlight (LHD). It is
clipped into a metal bracket and has 3 wire connections. A drawing is on
page 87.5 of the latest Bentley.

Mark

Barry Rokusek wrote:
>
> My AC is running so well, but now the cooling fan doesn't run at all!  When I kick the AC on the cooling fan has stopped runing all together.  Even when the van heats up.  I unplugged the thermal switch I THINK.  I hot wired it and it DOES run.  But it won't come on by itself!  I don't know what to do???  What should I check?  I also checked with a multi-meter, and there is power to one of the three wires all the time, the other has power when I kick the AC on.  And the third goes to the fan.  SO, I'm stumped!  I'd really appreciate some advice!  I'm getting REALLY frustrated:-(   Thank you so much!
>
> Barry
>
> Madison, WI