Thanks Mark,

Okay cool, that suggests the relay then. I had looked at a bunch of similar
issues in the archives and they all seem slightly different with different
resolutions. I had already jumpered across the plug and I get the relay
"clicking" on contact across the outer two terminals - nothing with either
side to the middle. I had tested the temperature switch (measured the
resistance - OC at cold, outer terminals short for low, all three
combinations short on high) and I initially tested the motor with 12V across
it in the vehicle - nothing. So I removed the fan and tested it on the bench
- ran just fine. Re-installed it and tested it directly with 12V again -
this time it ran just fine. So I retested the switch, same result and was
moving through to the resistor and relay - does that make sense?

Fuse is fine, as is the earth as far as I can see (Colorado Van, so no real
rust issues - all seems to be clean and dry).

Also having another issue with lack of headlights except when switched and
"held" on main/high beam, so relay is starting to look more of a likely
candidate. Anyone know which one it is? - The Bentley is a little confusing
on that!!!

Once more thanks for the help,

Paul.

On Mon, Jul 14, 2008 at 3:00 PM, mdrillock <mdrillock@cox.net> wrote:

> High speed does not use the resistor so that can't be the problem for that
> speed. Only low and medium speed go through it. Don't overlook fuse #1,
> on the left end position of the main fuse panel. All 3 speeds use it.
> Should be 30 amp.
>
> With the radiator temp switch wiring plug pulled off the switch, jumper any
> 2 pins of the wiring plug with small needle nose pliers. 2 combinations
> should run the fan, 1 at low and another at high speed. Middle speed is only
> run by the A/C.
>
> Another common failure point is the ground lug for the brown wire coming
> from the fan. It plugs into the grounding star behind the main relay panel.
> Many grounds plug in there and corrosion is a major issue on them.
>
>
> Mark
>
>
>
> Paul Connelly wrote:
>
>> Hi Volks,
>>
>> Next question... does anyone know or can check out with a meter what the
>> resistance should be on the resistor behind the drivers side headlight for
>> the radiator fan. I've lost the fan. Checked out the temp switch and its
>> fine - both stages switching to open circuit at the correct temps (ish).
>> Checked the fan and it is buzzing just fine with 12v applied direct -
>> leaves
>> the resistor and the relay if the archives are correct.
>>
>> Measuring at the back of the connector plug I get ~ 6 ohms across the
>> outer
>> terminals, ~ 4.3 ohms across the two terminals "closest" to each other and
>> ~
>> 1.3 ohms across the "spaced apart" terminals.
>>
>> Just wanted to check it out to eliminate it or confirm it as the
>> culprit...
>>
>> TIA
>>
>> Cheers, Paul.
>> 1986 Syncro Westy - Hummingbird
>>
>>
>>
>
>