Heater Fan Troubleshooting 1990 Econoline Ford Van

My friend has a 1990 Econoline van. Recently the heater stopped working. He thinks it has to do with the fan and was wondering where the fuses are the power the fan? Or if there's anything else that
could be wrong?
Any help/advice would be appreciated.
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fuse should be in fusebox he should turn on van and put blower on high and tap motor and see what happens rusto

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Thank you for the tip, Rusto. It turned out to be a corroded wire.

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