There is a large red wire behind the fuse block which connects to a yellow connected which feeds the fan. Mine was corroded and stopping the fan from coming on. Even if it is not bad it is worth cleaning for the future. 
         
                                          Stacy

Sent from my iPhone

> On Jan 21, 2017, at 8:36 PM, thewestyman <zolo@FOXINTERNET.NET> 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?