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If the fan turns on, it could be a short to power (two power wires shorted together) causing the increase in amperage. If the fan doesn't turn on, it's probably a short to ground after the switch in the circuit; where power is bypassing the intended path, which is the blower.

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โˆ™ 2006-09-21 01:25:54
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Q: Why might the 30 amp fuse for the heater-AC blower keep blowing when you turn it on?
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