heater blower mtr

[buick]

in stalled new blower mtr,non a/c,truck never had a blower with a cooling tube on it,now it runs gets hot,blows fuse,3rd motor,all electrical checks out,happen to anyone else?

[Ronno6]

Does the blower move air out the vents?
If the intake or discharge to/from the blower wheel is restricted or blocked off, the
motor will not incur the load of air movement and will over rev and overheat.
This will cause the fuse to ultimately blow.....