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when the blower motor resistor fails the blower switch defaults to the high position. autozone.com has a great tutorial on how to replace the blower motor resistor.
realfixesrealfast.com has a segment on blower motor resistors.
check fuses, then wiggle speed control while moving, may need new dash control for lower speed, usually high speed works through relay may be the reason high speed works
hello, this sounds like a bad blower motor resistor!! its cheap and easy to change..if you need more info on locations let me know,, good luck.....marty
The blower motor resistor is bad. The reisistor is located under the
dash by the blower motor. If the car has auto temp, the resistor is
like a small module and can be expensive.
The blower motor works on high setting ONLY when the blower resistor is
bad. The blower motor resistor is held in place with 2 screws and
attached into the heater housing under the right side of the dashboard.
You can identify the resistor by the big wires that are connected to
the connector. If this heating/cooling system is the auto temp type,
the part is a bit high on the price.
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