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If your car heater (same applies to most vehicles) only working on 1 speed setting normally the full power then most likely your heater resistor is faulty its the little box that sits on the fan motor assembly this quick video applies to all Mercedes that have the center console on top middle of dashboard.
Some vehicles fan motor assemblies are in the back of engine bay towards the middle others will be under the dashboard accessed from footwell so you will need a mechanic or competent person to change but on these Mercedes Vito/Viano its only 2 torx screws size 20 so very Easy to Do it yourself Save money and time going to the garage. DONT FORGET TO LIKE