At 08:53 AM 7/17/03 -0700, you wrote:
>Mark,
>      So this brings up an interesting question.
>Which speeds in the two speed matches which two of the
>three speed in the tree speed and why?

Power is supplied at all times to the thermo-switch in the radiator. It has
3 possible positions. When cold it is an open circuit, when hot it closes
the circuit to one set of coils (low speed) in the fan motor. When really
hot it closes the second circuit (While keeping the first circuit closed).
and that energizes the relay which supplies current to the second set of
coils (High speed) in the fan motor and the fan runs fast with both sets going.
The AC system also has control over the relay, and will close it to supply
current to the High Speed circuit of the fan regardless of what the
thermo-switch is doing. So if the engine's cool enough the fan will be
running at a medium speed that the non-AC vans never run at. If the
coolant's hot enough to close the low speed coil, the fan will of course
run at high speed with the relay closed, because both sets of coils are
supplied.
If I have mis-read the wiring diagram, Flame away people.  I have the
asbestos underpants on.