Yes I messed up and said 3 when I should have said 5. Good luck with the
project. Not too many posts about A/C lately for some reason.

Mark

Joe Federici wrote:

> Cheers Mark! I got it. Thanks so much for all the info. Did you mean  to
> say  the medium speed and the relay for it goes in main relay  panel
> socket #5 rather then #3? number 3 says coolant level control  unit?
> I've got the brown connector so and see the wire with yellow  connecter
> but and looking at the manual it goes into #5. That said I  know the
> manual can be wrong.
>
> JFF
>
>
> On Nov 29, 2007, at 3:55 PM, Mark Drillock wrote:
>
> Close but not right. The relay mounted up by itself is always the  high
> speed relay and fuse. The low speed setting does NOT have a  relay. On
> models with A/C there is also medium speed and the relay  for it goes in
> main relay panel socket #3.
>
> With the stock A/C, low speed comes on when the A/C is turned on.
> Medium speed comes on when the Freon high pressure switch triggers  it.
> High speed only comes on when the radiator gets too hot. When the
> radiator gets too hot it also turns off the A/C compressor clutch.
>
> Don't use the yellow/black for a fan trigger wire as it is for high
> speed and high is not intended to run for extended periods. You want
> medium speed. This is a small red/blue wire that comes out of the  brown
> T shaped connector and ends in a yellow female spade housing.  On page
> 97.143 it is on pin H6 of the main panel.
>
> In a 2 speed system, low is speed 1 and high is speed 2.
> In a 3 speed system, low is speed 1 and high is speed 3, leaving  medium
> as speed 2.
>
> (86+ can have any of 3 fan wiring setups. For non-A/C there is a 2
> speed small fan system and a 2 speed large fan system with the large
> fan version only seen in Syncros by me so far. With A/C all use a 3
> speed large fan system.)
>
> Mark
>
> Joe Federici wrote:
>
>> Mark-
>> OK I spent time going over the AC wiring I have and the wiring in  my
>> Syncro non-AC.  Tell me if I have this correct. On the Syncro I  have
>> a 2nd stage relay mounted by it's self behind the fresh air  vent,
>> above the main fuse panel but don't have the 3rd stage relay  #53 in
>> the main fuse box. On the AC wiring diagram and in vans  wired for AC
>> they call the one in the fuse box #53 the 2nd and  refer to the one
>> stand alone behind the vent as the 3rd. In effect  flipping them.
>> So all I need to do is pull the wiring harness from the Syncro and
>> use the AC harness and this will have the needed wires to plug  into
>> the fuse panel and use the #53 relay.
>> If this is correct I'm confused as to which relay comes on with
>> compress and evaporator is it the stand alone or the one in the  fuse
>> panel #53. I'm just interested wiring in the trigger wire  (#86) so
>> it  comes on with my new evaporator and the compresser.   Looking at
>> the  AC wire if I'm correct that's the Yellow/Black wire  on the
>> stand  alone relay.
>> JFF
>> On Nov 29, 2007, at 9:40 AM, Mark Drillock wrote:
>> Joe, there is no important difference between the 86-88 and 89-91
>> rad  fan wiring section of the A/C. Note that the fan wiring pages  in
>> the  Bentley have labeling errors for all 3 versions of the  larger
>> fan. In  spite of that all wires are shown and you should be  able to
>> do this  with minor hair pulling.
>> The biggest difference in the 2 versions of the A/C wiring itself  is
>> for the 2 Freon pressure switches. The early version has 2  pressure
>> switches with 2 separate connectors of 2 wires each. The  later
>> version has these combined into a dual pressure switch with  4 wires
>> together.
>> My understanding was that you were installing some other A/C  system
>> and thus you don't need the VW A/C wiring and can separate  the fan
>> wiring from it by unplugging a 2 wire and a 1 wire  connector. The
>> one  wire is a small red/blue stripe and the 2 wire  is a large
>> red/black  and small black/yellow.
>> Mark
>> Joe Federici wrote:
>>
>>> Thanks Mark, Is there an easy way to tell which year my AC wiring
>>> came from. I do have what looks like a complete set of the fan wiring
>>> but as for the year I'm a bit fuzzy as I'm not the person who pulled
>>> it out.
>>> JFF
>>> On Nov 28, 2007, at 9:35 PM, Mark Drillock wrote:
>>> Your Syncro already has the "third" fan speed and the relay for  it.
>>> What
>>> you are missing is the second speed with it's relay and wiring. The
>>> diagrams can be confusing about this since the 2 speed version calls
>>> full speed the 2nd speed and the 3 speed version calls full speed the
>>> 3rd speed.
>>> Assuming that you pulled the complete fan wiring sub-harness from  your
>>> 86+ A/C donor it should be straight forward to remove the lo/hi
>>> version
>>> fan wiring and install the low/med/hi wiring in it's place. VW  made
>>> this
>>> area of the wiring flexible by design so they could use any of 3 fan
>>> wiring schemes without needing different main harnesses. It is  plug
>>> and
>>> play.
>>> You need to unplug the Syncro fan harness illustrated on Bentley
>>> 97.200
>>> and replace it with the A/C fan harness illustrated on 97.141.  Dash
>>> out
>>> will be helpful. No wires need be cut. Everything unplugs.
>>> Mark
>>> Joe Federici wrote:
>>>
>>>> Does anyone on the list have experience adding the factory AC wiring
>>>> to a non-AC van. The only part I'm interested in is the 3rd speed
>>>> radiator condenser fan and which wire triggers it.
>>>>
>>>> I'm going to be using a different condenser and evaporator and just
>>>> need to wire in the needed relays or wiring to activate the fan and
>>>> wire it into my system so it comes on with the compressor. I've got
>>>> all the wiring and relays from a parts van that had AC but I'm  having
>>>> trouble figuring out what I need and don't need. My van is a 1987
>>>> syncro transporter so I've already got the fan used for the AC vans.
>>>> Looking at the manual I think all I need is to add the 2nd and 3rd
>>>> stage fan relays. One looks to be above the fuse panel and other is
>>>> behind the left fresh air vent but I'm not sure about the trigger
>>>> wire that activated the 3rd speed.
>>>>
>>>> If any knows please pmail me,
>>>>
>>>> thanks
>>>>
>>>> JFF
>>>>
>
>