After disassembling part of the car to get to the resister and then taking of it's cover, I found the top wire on the fan resister had corroded. I repaired it and now the fans work on low speed. I didn't need a new resister after all. The problem I am having with the high speed fans is being caused by the temp switch. Retesting it I found the resistance of the sensor erratic, it kept switching back and forth between normal and infinity when the car was at a steady 80c. Searching the board I found someone else that had this problem with there 560SEL.
See:http://www.peachparts.com/shopforum/showthread.php?threadid=7301

I should have the new switch installed by tomorrow.

Thanks,
Chris