Mercedes$430

I Have a 2001 Mercedes Benz S430 , am having troubles with my a/c blower motor at first it would only work if it was on low and if i turned it up it would shut off so i did some research so i recharged the system and it worked fine for awhile then fan motor went out again so i replaced the blower motor and the resistor , but the resistor burned up so i relplaced it and now its still not working all fuses are good and my a/c line gets cold i dont know what else it could be ... please help me

Soylent Green

I'll assume that you replaced the cabin air filter already, right?