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Date:         Thu, 29 Nov 2007 16:56:57 -0800
Reply-To:     Mark Drillock <mdrillock@COX.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mark Drillock <mdrillock@COX.NET>
Subject:      Re: AC 3rd speed fan wiring
Comments: To: Joe Federici <joefederici@EARTHLINK.NET>
In-Reply-To:  <A1443215-9F03-445C-8C8B-1DE28F693B17@EARTHLINK.NET>
Content-Type: text/plain; charset=us-ascii; format=flowed

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 >>>> > >


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