Well I decided to take a look in the engine bay to try to find the source of the problem. I thought a good place to start would be with the aux fans since I know for a fact that they do not work in the low speed setting.
I tried to find the white plastic connectors near the drier and think I found them but can't tell for sure. I also tried to find the low-speed resistor behind the headlight but I really didn't know what to look for. I then decided to look at the relays behind the fuse box and couldn't tell which relay's went to what. I took some pictures of what I the drier and the fuse box, maybe someone could point the proper relays out to me.





I also noticed a small black box just behind the brake booster that I thought might have been related to the fan, when I popped the cover off there was a blown white colored fuse. I have no clue what this goes to but it still has power going to it. I took a picture of it as well, under the cover there's a place for two fuses but only one space has wires going to it. If anyone knows what this is let me know, it seems as if this car has random fuses spread around everywhere. It's the box in the middle in the picture.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500