There are 3 versions of rad fan wiring for 86. There are separate
diagrams in the Bentley for each version.

Only 1 version used the relay in position #5 for the temp switch high speed.

The other 2 versions used a stronger relay mounted separately higher to
the left, above the ground stars. There is a strip fuse there too, on
the base socket of the relay. If you have one of those versions, maybe
that fuse has blown?

The rad fan temp switch doesn't know how hot the engine is, it only
knows how hot the radiator is. If the hot coolant flow to the radiator
is too small then the engine can cook but the fan won't come on. How hot
is the top passenger side corner of the radiator? That is the last part
to get hot.

Mark

thewestyman wrote:
> Hi all,
> Looks like I need a little help from the gurus.
> ‘86 Vanagon.
> Just flushed the system, changed the rad. switch, filled in new coolant, bled the system, ran the engine until hot.
> The temp goes high and I’m waiting for the fan to start but it does not.
> But if I short it at the plug of the temp switch of the radiator, it works.
> Although the second stage I could not make work the same way.
> Looking at the wiring in the book, I can’t find solution.
> I thought, the new switch would do it.
> Changed the relay at the #5 spot, as it is shown on the drawing.
> But nothing worked.
> Anyone has any idea?
>