Okay now I got the car all jacked up and checked all the wiring, nothing appears to be wrong.

I tried grounding the sender and all I get is a click from the relay but no power coming through to the fan???

So from this, correct me if I'm wrong:
the power from the battery is good,
the wire to the ignition is good,
the fan is good,
the sender MAY be good,
either the relay is no good or the yellow wire from the relay to the fan is cut.

Now how do I test the relay?? I'll go check the yellow wire while I wait.

Thanks again Pat,
Sean