Disregard, I realized that with a voltmeter I could determine which wire
was "hot"; the other two must then be switched.

I jumpered accordingly and verified that both fan speeds work.

Note to anyone who might want to do this -- the circuit is "hot" even
with the key off.

Allan
--
1991 Vanagon GL

Allan Streib <streib@cs.indiana.edu> writes:

> I exposed the thermo switch on the radiator, and removed the
> connector.  There is a Red/White, Red/Black, and Red/Blue wire on the
> connector.  What should I jumper to what to test the fan?