Ok, since you have an early/mid 86 Westy the A/C system wiring diagram
is not shown in the Bentley. Your retrofit A/C has no pressure switch in
the freon system and thus has no use for the middle fan speed that the
dangling wire was meant to be part of.

As David said, you should determine which size rad fan motor you have so
you can correctly assess any issues with the cooling fan system.

(the 4th digit - 'Z' tells that it is a Westy, the 10 digit - 'G' tells
that it is an 86 model. VW built more or less 12,000 vans per month so
the 51437 tells that was several months into model year production. VW
model year production began in July/Aug most years)

Mark

Gabriel Hourtouat wrote:
> MANY THANKS!  I will check that operation.
> I expect the wire will dangle because this van had a botched A/C retrofit
> that was installed by the VW dealership only one month after the van was
> originally delivered to the customer.
>.......
> VIN:
> WV2ZB0250GH051437
>
>
>
> On Mon, Jul 29, 2019 at 7:14 AM vw_van_fan_Mark <madvws@cox.net> wrote:
>
>> That dangling wire is intended for the A/C. It is to control the middle
>> speed rad fan relay from a pressure switch in the Freon system.
>>
>> If you look at the A/C wiring diagram for your year you can see that
>> connector H6 is used differently than in a non-A/C van.
>>
>> Also note that the relay output on H3 goes to a resistor first rather
>> than directly to the fan motor.
>>
>> Mark
>>
>>
>>
>> Gabriel Hourtouat wrote:
>>> ...
>>> I found a Red/Blue wire dangling with a nice yellow connector, not
>>> connected to anything.  It originates at position H6 (Bentley page 97.68
>>>.....