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Take it into the shop. It's a whole lot easier.
385 euros @ mercedes main dealer.
http://202tech.mkosonen.com/howto/blower.html detailed and illustrated how to with no need to visit MB stealership
have you checked the fuse if so then you will need to replace the resistor for the blower hig and low dettings have you checked the fuse do you have 12 volts to blower if so then you will need to replace the resistor for the blower replace the blower motor
how do you change heater blower resister merc a class
Continental/VDO New A/C Heater Blower Motor PM4820
Remove the wiring harness to the heater blower fan. Remove the retaining bolts. Remove the fan from the blower. Reverse the process to install the new heater blower fan.
it is right under the glove compartment
replace heater relay and or heater blower motor
Blower is a dual squirrel cage unit located under the wiper arm assembly. You will need to remove this and the engine bay fire wall center section to gain access.
Check fuse box - fuse #14
Replace the resister, if that doesn't work replace the blower motor.