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most vehicles have one circuit(and one fuse) for the first 3 fan speeds and a separate circuit and fuse for the highest speed.

AnswerCHECK THE BLOWER MOTOR RESISTOR
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โˆ™ 2011-09-13 22:55:30
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Q: What could be causing the heater blower motor to work only in the full blast switch setting - 1988 Suburban?
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