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replace the blower control switch One of 3 likely scenarios: Defective blower motor, problem with the switch or most likely is the resistor for the blower motor is bad. The resistor may also be referred to as a relay. THE BLOWER MOTOR RESISTOR IS MORE THAN LIKELY BAD IT DOES NOT SEND VOLTAGE THROUGH THE RESISTOR ON HIGH SPEED ONLY THE LOWER SPEEDS TO DROP THE VOLTAGE. 9 TIMES OUT OF 10 THIS IS THE PROBLEM. SHOULD BE ABOUT $20.00

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Q: Is there more than one fuse in the blower motor of a 1993 Ford explorer I have installed a new motor but the first three speeds do not work. Only the high speed on switch works?
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