Hello welcome to just answer I am master tech and will be able to assist you today.
these had 3 common failures 1 been a bad blower motor sub harness and the 2nd is a bad power transistor. 3rd is a bad blower motor
from the sounds of it the blower motor looks like it might be the issue here.
cause this shuts off while driving and then comes back on and im guessing after hitting a bump in the road just enough to move the brushes
What test should I perform to determine whether it is the blower motor? Transistor? Sub harness?
well unplug the blower motor and look at the plug see if it's melted.
this is what I would do run the blower motor and run it until it stop and then bang on the motor (under the glove box ) and it shoud come on if so replace the blower motor.
I doubt the transistor is bad cause they don't stop and start again
the blower motor will do that
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