I have a 1998clk 320. I had the blower motor replaced at the dealership about 3 yrs ago and just recently when the heater was on, it worked ok at times, it was loud and now doesn't blow air out at all. It hums a little like it is trying to work. Spoke with the dealership whereI had it replaced and they said it probably isn't the blower,maybe a fuse or electrical. Any suggestions?? Thanks

 

if it was the fuse i think it wouldnt even make a noise i had the same problem i replaced my hole unit i know i only did it 3 yrs ago but it sounds like its gone again. Make sure your blowers isn't bloked check the filter next to the blower unit as well.