heater motor just started vibrating really bad on 2006 Ford E-250

it does it all the time, the faster the fan runs the worse it is

by in Lewisville, TX on February 04, 2011
2 answers
ANSWER by on February 04, 2011
There may be debris in the plenum that the blower is vibrating against. It may need cleaned out. OR, the blower motor itself is worn.
ANSWER by on February 18, 2011
Look at the Fan , i have foungd that they crack . also have seen dirt /dust / debris, build up causing a ballance problem .