said by tp0d 
:Its possible the plastic stopped over top the motor itself and the heat melted the plastic. If that is the case, the motor could be heat damaged ($$$)
Either way, definetly dont run that thing, theres not only the risk of breathing plastic fumes, but the blower could overheat and catch on fire, destroying the furnace, and possibly more.
All of the blower motors I've seen had built-in thermal protection that opens the circuit should the windings get too hot. Yeah, running it like that with the thermal protection tripping all the time certainly can't be good for the motor in the long run, but you'd be hard pressed to cause a motor to self destruct or even catch fire.
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