Check to make sure that all of your connections are good. A bad ground will make things not work.

Also check the hot side with a VOM to verify voltage to the fan motor and resistence at the swtich.

If everything checks out good but the heater still doesn't work, then I'd probably replace the fan.

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1946 Chevrolet 3600 - "Old Number Seven"

Cavalry's Here. Cavalry's a frightened guy with a rock, but it's here.