Jeremy,
As Fred noted, the resistors are under the front cap. They are located on a vertical brace near the outboard (drivers) side and are each enclosed in a rectangular shield, since they get quite hot. That said, I think your problem is the fan motor itself since it is making a grinding sound. Also, the resistors are used on the 2 medum speeds, not for low or high. As Gerald said, the fan motors are available at almost any auto parts store. I got a replacement for one in our Marquis for about $30 at Auto Zone.
Steve