Date:         Sun, 5 Jun 2005 13:04:08 -0600
Reply-To:     jimt <camper@TACTICAL-BUS.INFO>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         jimt <camper@TACTICAL-BUS.INFO>
Subject:      Re: Radiator Fan Motor Low-Speed Inop
In-Reply-To:  <42d2267e05060510506474c1ae@mail.gmail.com>
Content-type: text/plain; charset="US-ASCII"

On 6/5/05 11:50 AM, "Detroit Bus" <detroit.bus@GMAIL.COM> wrote:

> Thanks Jim.
>
> I've actually never turned on the A/C, since it needs a recharge and
> I'm not an A/C sort of guy, but I'll go down and give that a shot. Its
> my understanding that the low speed setting operates independently of
> A/C, just goes on at a lower coolant temp than high speed.
>
> But anyway...the original question still stands:
>
> Since I've already jumped the radiator sender switch, and fed 12V
> directly to the red/black low speed lead which has continuity all the
> way to the fan motor's positive terminal, and the fan does not
> respond, what does this mean?  And why is there only one positive
> terminal when the Bentley implies there should be two?  And why are
> there no part numbers in the $79 Bentley manual??!!?? sorry just
> venting there.
>
> garrick
>
>
>
> On 6/5/05, jimt <camper@tactical-bus.info> wrote:
>> There are two things to check for the low speed.
>>
>> If the fan low speed does not operate but high speed does and
>> If vehicle is air conditioned, turn on the AC.  If the fan comes on the
>> circuits are good and the sender in the radiator is bad.  It has a two stage
>> switch in it.
>>
>> If the AC fan does not come on then the resistor pack is probably bad.
>> Found usually behind the headlights on most vehicles.
>>
>> If not AC equipped check the resistor pack and the switch in the rad.
>> jimt
>>
>>
>> On 6/5/05 11:03 AM, "Detroit Bus" <detroit.bus@GMAIL.COM> wrote:
>>
>>> Hello from 90 degree NYC:
>>>
>>> Why does the Bentley wiring diagram for an 87 show two positive posts
>>> on the radiator fan motor, when my fan motor has just one positive
>>> post and one negative post? Both hot leads are combined in one
>>> connection at the positive post on my motor, 251959455M. My vanagon
>>> has A/C.
>>>
>>> How does the fan motor know whether to go high speed or low speed? My
>>> low speed option isn't working and i'd like to fix it.
>>>>> I get 12.1 volts on the lo
>
> w speed lead and 12.6 volts on the high
>>> speed lead  when I jump the radiator thermoswitch (red/black wire and
>>> red/blue wire, respectively). If the single positive post is correct,
>>> does this mean I need a new fan motor? Or should the low-speed voltage
>>> be higher than 12.1? High-speed works fine: the relay clicks and the
>>> fan spins very nicely.
>>>
>>> I've searched the archives and apparently there was something about
>>> this on Ken Wilford's site at one time which I can't find.
>>
>>
>
I forgot to mention the relay. Which you located.  From what you say I would
first replace the relay and then do jumper tests from the two terminals on
the temp switch.  And I think you need drawing 97.138 and I think you are
using 97.117  the relay is the one in the center of the three shown.

Jimt