In a message dated 98-07-02 06:33:45 EDT, kdlewis@JUNO.COM writes:

<<
 Scott;
 Here is a way to test the thermo-switch. Locate the switch on the
 radiator and disconnect it. The plug (connected to the wires) has three
 connectors. Short across two at a time, you have three combinations to
 choose from. Your results should be high fan, low fan and no effect. If
 that is what you get suspect the switch.
 Drive Safely & Good Luck
 Ken Lewis<Kernersville,NC> >>

 Scott, after doing the  above checks as Ken has mentioned, and the fan only
comes on at a high speed, then you need to replace the resistor pack behing
your left head light bucket, wich is for your low speed.  The Bentley manual
has a horrible wireing diagram for this, it doesn't even show the resistor
curcuit.  Good luck.  Michael Modl 87 syncro.