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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
it does it all the time, the faster the fan runs the worse it is
(2) Answers
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.
Look at the Fan , i have foungd that they crack . also have seen dirt /dust / debris, build up causing a ballance problem .