Having problems with your 2002 Oldsmobile Alero ?

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

Posted / edited by AnonymousUser on : 22-01-2018

Answers :

The blower motor resistor is faulty.
\015\012On high speed, battery voltage is directed right to the motor.
\015\012For any other speeds, battery voltage runs through the resistor pack (in any of 3-4 ways) to reduce voltage and slow the motor down.
\015\012The 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.
\015\012You can consult this link http://www.automotiveforums.com/vbulletin/showthread.php?t=665246
\015\012for replacement of the resistor (the thread says Grand Am, but your Alero has the same setup)
\015\012Thanks for using FixYa!
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