Yup, the standard repair requires tearing the dash apart.Took it to mechanic this morning, he said motor is fine but the door that mixes air needs fixing and quoted 15 hrs of labor with price tag of $950
You need to update your user profile to reflect year, model and market of your vehicle.Turned out to be not a issue with blender motor. Replaced new motor but still same problem. Problem is as soon as you connect motor it's excited immediately and turn full on to one side. I asked mechanic to disconnect the electrical cable to the motor for time being and adjust motor so it stays right in middle, that way I don't get hot air anymore.
Mechanic said most likely it's the control unit where this blender unit is connected to has gone bad. I went to Mbenz dealer to check for the part# but dealer had difficulty locating part# for this unit. Does anybody here know what the part is called or part# which controls blender motor.
Shop that took on this work has to have subscription to some sort of information database. Alldata, startekinfo.com or something similar. Without that you are paying for guess work.Interior temperature sensor was double checked by technician and that doesnot seem to be the problem. What else could be issue ?