Question about 1999 Oldsmobile Alero
You need a new blower resistor by the sounds of things. When you select the three lower speed settings, the current supplied to power up the blower motor goes through the resistor, to slow the speed of the blower motor down. When the high speed is selected, the resistor is bypassed, and full current is passed to the blower. I believe the resistor is $12 at an auto parts store. Good Luck Tim
Posted on Mar 30, 2011
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Posted on Jan 02, 2017
remove the trim panel below the glove box and you will see the blower motor,just to the left of it you will see a 4 wire connector plugged into the case. This is the blower motor resistor,this is what you need to replace.
Posted on Feb 12, 2009
I'd replace blower resistor, usually found under hood on firewall on passenger side, or on duct work, inside under dash on passenger side,close to blower motor.
Posted on Jun 01, 2009
It is the Blower Motor Resistor located behind the Glove Box on the dash. Remove the Glove box to access. It is mounted against the fire wall. This is a common problem. My 2002 did the same exact thing.
1. Disconnect the negative side of Battery.
2. Disconnected the Electrical Connection to the Resistor.
3. Remove the bolts/screws. I believe they have 8mm heads, there should be 2 of them.
4. Replace with new one.
5. Reconnect the negative side last.
6. Test System before putting the glove box back in!
7. Enjoy the CONTROLLED HEAT!!
Posted on Nov 25, 2009
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