Question about 2002 Oldsmobile Alero

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Heater problem The heater only works on high speed setting. Any ideas ????

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  • jkkrey Sep 04, 2008

    Thanks for the hint, I will try it.

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The blower motor resistor is faulty.

On high speed, battery voltage is directed right to the motor.
For any other speeds, battery voltage runs through the resistor pack (in any of 3-4 ways) to reduce voltage and slow the motor down.

The resistor is located (screwed in) inside the heater duct or box somewhere where cold air always contacts it (before the heater core) because it becomes hot and would melt if it wouldn't be constantly air cooled.

You can consult this link http://www.automotiveforums.com/vbulletin/showthread.php?t=665246

for replacement of the resistor (the thread says Grand Am, but your Alero has the same setup)

Thanks for using FixYa!

Posted on Sep 02, 2008

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