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The circuit for high speed involves the relay to be closed. On a 1995 Chevy Pickup it is located behind the glove compartment. The lower speeds use a fan resistor pack for the different speeds. The voltage supplied to the resistor pack is usually a 25 amp inside fuse. The high speed circuit is supplied by a constant 12 volts that turns on the fan when the relay is energized. The voltage for the high speed circuit comes from a fuse under the hood. Usually a 50 amp. If all fuses are good then there might be a fusable link in the wire somewhere.

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Q: Why would an AC fan blower motor work on all speeds but high?
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