From a thread by Gary Degand on VOLT. Replacement Bosch number for the motor: 0130007027 (only 45€ on amazon.de)
Fan is removed with a heatgun and vice. Heat the plastic slowly, then slide it off. Heatgun on the fan for a long time, and pried it off. Use a wooden beam between the side of the vise and the fan. The plastic gets soft!
New resistors too (part number 281 905 109 A)
New radiator too...