Look for an inline set of wires near the blower motor. The resistor is in the air plenum to keep it cool. It is held in with a couple screws typically. If the fan works on high not not other speeds, then it is the resistor. This video shows where to look. Have replaced on a Nissan but not Mercedes. Mercedes vito heater fan replacement
SOURCE: I have a 2002 Merc Vito CDi 112 and the Poly Vbelt
http://ww2.justanswer.com/uploads/MBpaul/2009-11-05_155436_112_SUMP.JPG
shows the belt run, low quality but may be enough to do it.
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SOURCE: serpentine belt diagram for mersedes vito cdi 109
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