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Date:         Mon, 23 Jan 2017 10:04:38 -0800
Reply-To:     vw_van_fan_Mark <madvws@COX.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         vw_van_fan_Mark <madvws@COX.NET>
Subject:      Re: Temp high, no fan ...
Comments: To: Gordon <gordonmahung@gmail.com>
In-Reply-To:  <btij1u01U12Zc5W01tmdUq>
Content-Type: text/plain; charset=UTF-8; format=flowed

Yes, there are 3 possible fan wiring arrangements for 89 as well. This is true for 86-91 vans.

Most of the recent vans I have helped with that had no fan coming on turned out to have a bad ground connection for the fan motor. The end of the ground wire that plugs on the ground stars under the dash is what often goes bad. It may even work sometimes but not others. It is important to fix this since it may happen at the worst possible time.

If your van came with factory A/C then you should use the separate A/C wiring diagram for looking at the fan wiring.

If your van is a Syncro but didn't come with factory A/C then you should use the separate "450 watt fan" wiring diagram. (page 97.200)

If your van isn't a Syncro and didn't come with factory A/C then you should use the main vehicle diagram for your year.

There is a complication with the A/C diagrams as the wire colors given for the fan motor wiring have some mistakes in them. This can make tracing out problems more of a challenge.

Mark

Gordon wrote: > Piggyback-Ing on this thread on behalf of my 89 with similar problem of fan not coming on. Mark, do your comments apply to the 89 as well? Or should I be looking elsewhere? > > - g > >> On Jan 22, 2017, at 4:15 AM, vw_van_fan_Mark <madvws@COX.NET> wrote: >> >> 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? >>> >


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