Anyone else had the same problems with heat & A/C &, if so, were they corrected

On the S550,2011 and 2012, when it is cold, the heat will not work most of the time unless you put it on "high". The dealer said to take it off of automatic and put it on manual. What in the world? Is this a Mercedes or a Ford? At least on the Ford, the heat works. This has happened on two different year models. The only way you can get any heat is to put the heat on "HI". When you do that, it gets so hot in the vehicle you cannot breathe, and then you have to let it cool off, and start the process again. One of the dealer's solutions was to do as you had to, and turn the car off and restart it. The dealer said he thinks my vehicle is possessed. I took it to him one day, and even though the settings were the same on the driver's side and passenger side, there was heat blowing from one side and AC from the other. I think it is a defect Mercedes is not willing to admit to. Meantime, the rest of us have to suffer with a heating system worse than a junk car.

poss blower motor resistor

I have same problem was it ever fixed and how much