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Chevy S-10
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Oldsmobile Ninety-Eight
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Where is the high speed blower motor relay on the 1993 Oldsmobile 98?


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Wiki User
2005-11-29 09:14:46
2005-11-29 09:14:46

The "relay' may be under the plastic cover on the fire wall close to the fan motor except it is a transistorized speed control circuit. Look for 2 wires from the fan motor going to a three or four pin plug onto the circuit board.

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The blower motor fuse protects the blower motor electrical circuit. The blower motor relay operates only the high speed function of the blower motor. The blower motor speed resistor operates the lower speed functions of the blower motor.

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The blower motor high speed relay is located under the hood, on the passenger side firewall close to the blower motor. The blower motor speed resistor is also located in that same area.

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A typical blower motor relay only operates the high speed function.

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Swap the relay with a known good one, many of the relays are of the same part number. Keep in mind that the blower motor relay only controls the high speed function. The blower motor speed resistor and the blower motor switch controls the lower speeds.

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99% of the time, the blower motor relay, or resistor block,will be bad if the fan motor only works on high speed.


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