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Heater blower will only work on high - 1999 Oldsmobile Alero

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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

chuck943
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SOURCE: Mercury Cougar heater blower only works on high.

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

motor1258
  • 6674 Answers

SOURCE: heater blower switch only works on high

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

  • 14036 Answers

SOURCE: 1996 plymouth voyager van blower --high only

YOUR BLOWER MOTOR RESISTOR IS BAD OR THE BLOWER MOTOR CONTROL SWITCH COULD BE FAULTY.

Posted on Sep 13, 2009

  • 1757 Answers

SOURCE: heater/air cond blower only works on high. any

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

  • 73 Answers

SOURCE: Heater/AC blower works on high only

Blower housing resistor fried up.You will have to replace whole blower assembly.

Posted on Jan 04, 2010

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