As I set out to check voltage, I started the engine and the blower
motor was blasting air thru the ducts at high speed (the button was set on high from yesterday). This lasted about 30 seconds-
no buttons were pressed-and then it cut off completely. Evidently there is voltage. Then tested the fuse connectors- 13 volts.
Could it be:

A. the bearings in the motor housing are worn and its not sitting in the center to spin freely and needs replacement.

B. a wire to the motor is loose causing intermittent on and off.

C. a bad fan button unit.

D. your thoughts here Gilly,- I puzzled.

Allen