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It just started doing that last week. It seems that if it sits idling about 15 min. it works. When the wipers are dead there is no click or anything. I am just trying to catch it in the act now. Doesn't seem to be getting voltage to the motor, relay maybe? Have volt meter and know how to use it.
Update: at 12° I got down to the motor, gave it a little tap with a hammer and it took off running. Sprayed all moving joints with CRC, (not WD-40) and have had one instance when they didn't work. A couple times at 15° they worked. New motor is in order if it stays cold in MI.