I would try unplugging the offending parts of the circuit and seeing if the fuse blowing goes away. If not, I would leave the fans on with your set up to check it out (running power directly to the fans from the battery) with an in-line fuse of the rating in your fuse box for this circuit, and take it to the shop to have it fixed.
Sounds like a wire has been scuffed or abraded and now is shorted to the car frame somewhere. With a multimeter and some patience you can probably take care of the issue by identifying the circuits and testing them to see if they are shorted.
Good Luck, Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)